To acclimate yourself to the wireless communication space, you need to know the language. Here, we have provided a collection of terms frequently used in discussions and descriptions of wireless communications.

# | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

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	411 Directory Assistance A service offered by T-Mobile that allows you to contact a live operator 24 hours a day to help you get the information you need when you need it. In addition to finding phone numbers, you can request your daily horoscope, weather reports, and sports scores. Simply dial 411 from your T-Mobile phone and get the information you need right way. In most cases, a T-Mobile operator will even connect you to your requested phone number. 802.11b Also known as Wi-Fi -- an over-the-air interface between a wireless client and a base station or between two wireless clients. It applies to wireless LANS and provides 11 Mbps transmission, allowing wireless functionality comparable to Ethernet. 802.11 defines the standard for wireless LANs encompassing three incompatible (non-interoperable) technologies: Frequency Hopping Spread Spectrum (FHSS), Direct Sequence Spread Spectrum (DSSS), and Infrared.

Index - A Back to top
	Access Fee A 3% federal excise tax carriers are allowed to charge wireless subscribers for the right to connect with the local telephone network. Wireless subscribers are charged a monthly access fee whether they use the telephone or not. Access Point In a wireless local area network (WLAN), an access point is a device that serves as a communications hub to provide a wireless connection to a wireless-enabled computer. It connects users within the network and can also serve as the point of interconnection between the WLAN and a fixed wire network. Each access point can serve multiple users within a defined network area; as people move beyond the range of one access point, they are automatically handed over to the next one. Account Expiration Occurs 90 days after the customer's airtime/balance expiration is $0.00/0. If you don't refill your account in the 90 day timeframe between airtime/balance expriation and account expiration, T-Mobile may deactivate your service and recycle your phone number. Account Permissions Feature which allows the Primary Account Holder of an account to manage what other users on their account are allowed to do within My T-Mobile. For example, the Primary Account Holder could choose for one of their users to see the entire bill for the account including balance due or choose for that user to only see the charges specific to their phone. Activation The process of configuring a wireless telephone so it can be identified on a wireless network, and it can make and receive calls. Activation Fee A one-time charge per line that will appear on your first monthly billing statement. Add-a-Line Monthly recurring charge for additional lines (beyond the minimum number required) added to a pooling plan. Additional Minutes The amount you pay per minute for minutes or megabytes of service you use beyond your monthly allotment. ADN Abbreviated Dialing Number -- Another term for "speed dial number" that can be programmed into your phone or smart card memory. You can add people to the phone book on your T-Mobile phone by entering the names and numbers online from the Communication/Phone book section of My T-Mobile. The entries are automatically saved to your phone. ADSL Asymmetrical Digital Subscriber Line -- See DSL for definition AIM® AOL® Instant MessengerTM -- A two-way messaging service that allows you to talk with your friends, family, and co-workers while you're on the go. By using your mobile phone, you can talk to the online community or other mobile phones using AIM®. Airtime Partial minutes used are rounded up and charged, or deducted from any allocated minutes, as full minutes; calls and sessions are measured from the time the Network begins to process the call (before the phone rings or the call is answered) through its termination of the call. For purposes of time or day rating, an entire call is rated from when the call starts. Airtime Expiration The point in time when the minutes applied to your account have all been consumed (i.e.your balance is at 0 minutes). Similar to balance expiration. Airtime Expiry Term used in EasySpeak® prepay service which refers to the date when the time allocated for using airtime credited to account is up. Same as balance expiry . ANSI American National Standards Institute Any Key Answer A feature on some phones that lets you answer your phone by pressing any key. AOL® Instant MessengerTM (AIM®) The AOL® Instant MessengerTM Service (AIM®) is a two-way messaging service that allows you to talk with your friends, family, and co-workers while you're on the go. By using your mobile phone, you can talk to the online community or other mobile phones using AIM®. Buddies can be logged in on any system -- phone, handheld, computer, etc. Authentication A practice used by wireless carriers to reduce fraudulent use of a telephone by confirming the identity of the telephone prior to call completion. The wireless telephone's Electronic Serial Number (ESN) is used for authentication. Authorized Users The account holder and those authorized by the account holder to make changes on a T-Mobile account. Auto Dial Number  Abbreviated ADN -- Another term for "speed dial number" that can be programmed into your phone or smart card memory. You can add people to the phone book on your T-Mobile phone by entering the names and numbers online from the Communication/Phone book section of My T-Mobile. The entries are automatically saved to your phone.

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	Balance Expiration The point in time when the dollars applied to your account have all been consumed (i.e. your balance is at $0.00). Similar to airtime expiration. Balance Expiry Term used in EasySpeak® prepay service which refers to the date when the time allocated for using airtime credited to account is up. Same as airtime expiry. BAN Billing Account Number -- for individual plans, the BAN is your 10-digit T-Mobile number. For multiline or FamilyTime® plans, the BAN is the 10-digit T-Mobile number of the primary account holder. Bandwidth The transmission capacity of a computer channel or communications line, or the amount of information that a communications system can carry. Bandwidth is expressed in cycles per second (Hertz), the bandwidth being the difference between the lowest and the highest frequencies transmitted. Bandwidth is also expressed in bits per second (bps) or bytes per second (Bps). Base Station The central radio transmitter/receiver that maintains communications with a mobile telephone. Most countries require several hundred base stations, in order to give approximated full coverage for mobile subscribers. Base Station Controller/base station system/base transceiver station The heart of a cellular mobile phone system is a network of distributed transmitting/receiving radios in fixed locations called base transceiver stations (BTS). A base station controller (BSC) is used to control groups of BTSs, provide mobility management for mobile stations, anchor airlink protocols and provide connection to a mobile switching center (MSC). The composite collection of one or more BTS and the associated BSC will form a base station system (BSS). Battery Life The amount of time the battery holds power after one standard charge. Battery life is usually spoken of in terms of "talk time" and "standby time". Talk and standby times and other specifications are provided by the manufacturer and are approximate. Actual performance varies based upon features or services used, network configuration, signal strength, operating temperature, customer use, and other factors. Baud Rate The rate at which data is transferred. BG Border gateway -- The border gateway or BG provides interconnection between GPRS networks across inter-PLMN backbones. Bill Cycle The schedule on which your invoice is generated. Also, in cases where customers have a "bucket" of minutes, the date on which the bucket "resets", and starts counting over. Bit The smallest or basic unit in the digital representation of information, a bit can be thought of a binary digit taking the value of 1 or 0. Bits Per Second Also known as BPS -- Transmission rate for data. BlackBerry® Designed for corporate environments, this end-to-end wireless e-mail solution with integrated phone brings new meaning to connectivity. BlackBerry Enterprise Server Integrates with your corporate e-mail systems in a Microsoft® Exchange or Lotus® DominoTM environment. BlackBerry Web Client An Internet-based e-mail interface that can retrieve e-mail from up to 10 e-mail accounts. The Web Client will redirect e-mail wirelessly to a BlackBerry handheld. BluetoothTM The code name for a new wireless technology being developed by Ericsson, Intel, Nokia, Toshiba and IBM, that enables data connections between devices such as desktop computers, wireless telephones, electronic organizers, and printers in the 2.4 GHz range Bookmark A URL or Internet address of a particular location or page on the Web. Browsers provide means of assigning such addresses easily recognizable names and of storing them in interactive lists for ease of access and reuse. Border Gateway The border gateway or BG provides interconnection between GPRS networks across inter-PLMN backbones. BPS Bits per second -- Transmission rate for data. Broadband A high-speed, high-capacity transmissions channel. Broadband channels are carried on coaxial or fiber-optic cables that have a wider bandwidth than conventional telephone lines, giving them the ability to carry video, voice, and data simultaneously. Broadband is often used to send different types of signals simultaneously. Browser A software application that enables its user to access and interact with much of the information available on the Internet or World Wide Web. BSC/BSS/BTS The heart of a cellular mobile phone system is a network of distributed transmitting/receiving radios in fixed locations called base transceiver stations (BTS). A base station controller (BSC) is used to control groups of BTSs, provide mobility management for mobile stations, anchor airlink protocols and provide connection to a mobile switching center (MSC). The composite collection of one or more BTS and the associated BSC will form a base station system (BSS). Bucket Home airtime minutes that are included as part of the monthly access charge. BuddyTimeTM An optional add-on service that offers unlimited national mobile-to-mobile calling between T-Mobile phones on the T-Mobile network and unlimited domestic text messaging for $10.00 per month. Byte A byte is a sequence of bits (usually 8) which represents a single character, such as a letter of the alphabet, a decimal digit, or a punctuation mark.

Index - C Back to top
	Cache A dedicated bank of high-speed memory or a reserved section of regular memory used to improve performance. The cache provides a temporary storage area for instructions and data that perform closer to the CPU's speed. Generally, the larger the cache, the faster the performance, since there is a greater chance that the instructions or data requested are already in the cache. Sometimes, caches are created and never cleared; cache and semaphore buildups are primary reasons for server "slowness" and restarts. Call Center T-Mobile Call Centers are staffed with Customer Service Representatives (CSRs) who provide information to T-Mobile customers on matters ranging from rate plans and activation to "questions about my bill," and wireless-equipment technical support (handsets, RingTones, wireless accessories, etc.). T-Mobile's Call Centers are located in Albuquerque, Bellingham, Bethlehem, Fort Lauderdale, Kansas City, Salem, Tampa, and Wichita Call Forwarding Have your calls automatically forwarded to another number. Note: Airtime rates, roaming and long distance charges (if any) may apply to each portion of a forwarded call. Call Waiting Lets you place a call on hold to mute conversation or make/receive another call. Note: Airtime rates, roaming and long distance (if any) apply for both calls. Caller ID Lets you see who's calling before you pick up the phone. Note: Due to public telephone network limitations, caller ID may not always be available. Caller ID Pictures Graphics you can assign to phone numbers to know who is calling with just a glance! T-Mobile offers you the ability to send caller ID pictures to selected phones. Note: Due to public telephone network limitations, caller ID may not always be available. Camera Phone A wireless phone with a camera function. Some cameras are integrated with the phones, other are small attachments. You can take photos with your camera phone and send them using t-zonessm to any e-mail address or T-Mobile phone, or view them on your phone's color display. Club T-Zones A special place, accessible only from your t-zones phone, where you can download RingTones and pictures, track your favorite bands, get updates on new smash movies, and be the first in line to get the latest news. Carrier A term loosely applied to any telecommunications operator providing voice and/or data services. Also used as a shortened form of "carrier signal". Carrier Signal A signal transmitted at a pre-determined frequency to act as a "carrier" for voice or data. The carrier signal is modulated by voice or data input so as to "carry" the information to its destination where the modulation process is reversed to recover the original information. CDMA code division multiple access -- Wireless communication transmission standard, allowing multiple voice conversations to be carried concurrently on the same frequency. CDPD cellular digital package data -- A data transmission technology used to send data to and from cellular devices. CDPD can achieve data transfer rates up to 19.2 Kbps. Cell The basic geographic unit of a wireless system and the basis for the industry term cellular. An area (city, county, rural area, etc.) is divided into cells, each of which is equipped with one or more low-powered radio transceivers. Cell size can vary depending on terrain, vegetation, urban attenuation, demand for capacity and other factors. By controlling the transmission power and the radio frequencies assigned from one cell to another, a computer at the Mobile Telephone Switching Office (MTSO) monitors the movement of the wireless telephone and transfers the call from one cell site to another. Cell Site An alternative name for a base station transceiver or its site. Cellular A wireless technology that re-uses frequencies by dividing the recurring spectrum into small, geographic cells. Cellular Digital Package Data also known as CDPD -- A data transmission technology used to send data to and from cellular devices. CDPD can achieve data transfer rates up to 19.2 Kbps. CIF Refers to the resolution size of the images a camera phone captures. CIF is 352 x 288 pixels resolution. CIF resolution is recommended for phone-to-phone use. See also VGA. Circuit Switched Data Also known as CSD -- Data communication over a dedicated channel or circuit assigned on a per call basis. CSD calls are often metered and priced by the minute like voice calls. Circuit Switching The process of establishing and maintaining a phone circuit or connection between two communications points so that the users have exclusive use of the communications path until the connection is released. Client Any computer connected to a network that requests services (files, print capability) from another member of the network. 'Client' also refers to the software that makes this connection possible. Club T-Zones A special place, accessible only from your t-zones phone, where you can download RingTones and pictures, track your favorite bands, get updates on new smash movies, and be the first in line to get the latest news. Code Division Multiple Access Also known as CDMA -- Wireless communication transmission standard, allowing multiple voice conversations to be carried concurrently on the same frequency. COM Port Also known as a communications port or serial port. The COM port is a location for sending and receiving serial data transmissions. Command A directive from the user to a computer to perform an immediate action. Communicator A new category of electronic devices, which are characterized by the ability to function as full-featured mobile handset, wireless data device, and PDA in a single integrated and compact unit. Conference Calling Lets you add a third person into any conversation. Note: The initiator of the call will be charged airtime, roaming and long distance (if any) to all calls during a conference call. Some devices do not support conference calling. Cookies In computing and the Internet, the collective name for files stored on your computer's hard drive that hold information about your browsing habits, user preferences, the last page you visited, login or registration information, "shopping cart" information, and other information a Web designer decides to save for future use. Cookies are usually set to expire after a predetermined time. Coverage Area The geographical area served by all cells within a wireless system. Some coverage areas are called expanded coverage areas because they encompass multiple wireless systems. T-Mobile's Interactive Map tool shows you T-Mobile's ever-expanding coverage. CSD Also known as circuit switched data -- Data communication over a dedicated channel or circuit assigned on a per call basis. CSD calls are metered and priced by the minute like voice calls. CTIA Cellular Telecommunications & Internet Association. The CTIA certifies wireless products operating on the major wireless technology platforms in North America and has created a Consumer Code for Wireless Service. Customer Care Customer Care is available 24 hours a day, 7 days a week for activation, service, and billing questions. It's always free to call domestically; dial 611 from your T-Mobile phone or 1-800-937-8997 from any other phone. Or e-mail customercare@T-Mobile.com.

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	D-AMPS Digital Advanced Mobile Phone System -- Earlier designation of American standard for digital mobile telephony used primarily in America, Australia and parts of Russia and Asia. Data Programs, files, and other information stored in, communicated, or processed by a computer. T-Mobile Internet plans include unlimited data transfer. Data Cable A cable used to connect devices to transfer data. Data Transfer Data transfer is the amount of information/data received or sent from a wireless device to or from the network. Database A set of related files that is created and managed by a database management system (DBMS). A DBMS can manage any form of data including text, images, sound, and video Deactivation The process of removing a subscriber from the wireless system, and releasing the SIM and MSISDN for use by future subscriber. Deactivation does not always result in the closing of the customer's account because other telephones on the same account may remain in service, or the customer's account balance may be greater than zero Decryption This refers to the act of decoding encrypted information so that it can be understood. DECT Digital Enhanced Cordless Telecommunications -- A standard for cordless telephony. Detailed Billing All T-Mobile bills provide accurate and detailed records of all calling activity. Detailed Paper Bill You can opt to receive a detailed paper statement that itemizes all your calls, usage, service charges, taxes and fees. View all your activity on the account, within the billing cycle, for only $1.99/month. Dial Up A configuration where a modem and the Public Switched Telephone Network are used to establish a non-dedicated connection to the Internet or other network. Non-dedicated implies that the connection is established as needed, and then released when service is no longer required. Digital Transmission method for wireless service. Voice conversations are converted to binary code, then transmitted and reconstructed for the receiver on the other end. Allows for much greater transmission capacity, as well as increased security for conversations. Digital Advanced Mobile Phone System Also known as D-AMPS -- Earlier designation of American standard for digital mobile telephony used primarily in America, Australia and parts of Russia and Asia. Digital Enhanced Cordless Telecommunications Also known as DECT -- A standard for cordless telephony. Direct Sequence Spread Spectrum Also known as DSSS -- A wireless LAN technology, Direct Sequence Spread Spectrum uses a radio transmitter to spread data packets over a fixed range of the frequency band, spreading its signal continuously over a wide frequency band. DNS, DNS server Domain name server -- A system of computers which converts domain names and APNs into their corresponding Internet Protocol (IP) addresses and supplies the information to routers and other Internet elements on request. When you request the home page for http://www.T-Mobile.com, the DNS translates the domain name into the IP address: 192.168.2.59. The DNS makes navigating and using the Internet easier for everyone. See IP and IP Address Domain An Internet domain consists of a set of network addresses organized into levels for purposes of identification, routing, and information delivery. The top level generally identifies a type of organization (e.g. ".com" for commercial, ".org" for non-commercial , and ".net" for communications network) or a geographic location such as a country. The second level identifies a unique place within the top level grouping and is equivalent to a unique address on the Internet. Domain Name Server Also known as DNS -- A system of computers which converts domain names and APNs into their corresponding Internet Protocol (IP) addresses and supplies the information to routers and other Internet elements on request. When you request the home page for http://www.T-Mobile.com, the DNS translates the domain name into the IP address: 192.168.2.59. The DNS makes navigating and using the Internet easier for everyone. See IP and IP Address Downlink Most data-communication connections are bi-directional. The direction toward the remote user is referred to as the "downlink". The direction away from the remote user is referred as the "uplink". Driver A driver is a program that controls a device; it acts as a translator between the device and programs that use the device. DSSS A wireless LAN technology, Direct Sequence Spread Spectrum uses a radio transmitter to spread data packets over a fixed range of the frequency band, spreading its signal continuously over a wide frequency band. Dual Band Dual band mobile phones can work on networks operating on two different frequency bands. Often urban areas operate on 1800, while suburbs use the 900 band. Dual band phones are especially useful if you travel abroad. Some phones, known as tri-band phones, are able to switch between GSM 900, 1800, and 1900 allowing you full coverage in Europe, America and Asia.

Index - E Back to top
	E911 Enhanced 911 -- A project improving the effectiveness and reliability of wireless 911 service by providing 911 dispatchers with additional information on wireless 911 calls. Early Termination Fee A fee applied after the trial period if the customer wishes to close their account with T-Mobile before the contract period is complete. EasyPay The quick and easy way to automatically pay your bill. Sign up with EasyPay and your monthly payment will be automatically deducted from your credit card or bank account. You will continue to receive a monthly statement by mail. Since funds are transferred no earlier than 3 days before your bill's due date, there is plenty of time to review your statement and call us with questions or comments. No stamps, no checks, and no late fees means no worries. Best of all, EasyPay is FREE. EDGE EDGE (Enhanced Data for Global Evolution) is the next step in the evolution of GSM following the release of GPRS, offering two to three times higher data rate capabilities in the existing spectrum. The maximum data rate (per timeslot) for GPRS is 20 kb/s while EDGE offers 59.2 kb/s. The result is an improvement in loading on the network and increased data throughput per user, which allows for new services to be introduced to our Customers. Electronic Serial Number Also known as ESN -- Each wireless telephone is assigned a unique electronic serial number, which is automatically transmitted to the base station each time a call is placed. The MTSO authenticates the ESN to determine if the telephone is activated or stolen. Encryption The process by which communication or subscriber information is combined with the appropriate GSM algorithm, which can only be decoded by a system with the appropriate Ki information. Provides the security for all transmissions over the GSM network. Enhanced 911 abbreviated E911 -- A project improving the effectiveness and reliability of wireless 911 service by providing 911 dispatchers with additional information on wireless 911 calls. Enhanced VoiceMail This service is included free on all plans $34.99 and higher. It has all the capabilities of our standard VoiceMail service, plus more messages, a personal greeting, broadcast messaging, and the ability for callers to dictate text messages to operator by voice. Note: You can receive up to 500 free minutes of messages per month. Additional minutes of messages charged at airtime rates. You will be charged $0.50 for each operator-assisted message. Equipment Installment Plan (EIP) Ability for the customer to finance their handset over a period of time to make the cost more affordable. Error Detection & Correction Refers to various techniques used to detect and correct errors that may be introduced when digital data is copied, moved or transmitted to another device. Detection and correction technologies generally require that the data be expanded to include additional information which can noticeably impact the rate at which the effective information is delivered. ESN Electronic Serial Number -- Each wireless telephone is assigned a unique electronic serial number, which is automatically transmitted to the base station each time a call is placed. The MTSO authenticates the ESN to determine if the telephone is activated or stolen Ethernet The most widely used LAN access method, which is defined by the IEEE 802.3 standard. Ethernet is normally a shared media LAN meaning that all devices on the network segment share total bandwidth. Extensible Markup Language Abbreviated XML -- W3C's standard for Internet markup languages. WML is one of these languages. Extranet An extranet is an external extension of a company's intranet that allows limited, external access to defined portions of the intranet.

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	FamilyTimeTM Share your wireless minutes and services with up to five different phones, each with its own phone number and line of service. Our FamilyTimeTM plan, featuring unlimited mobile-to-mobile calling, is great for families who call one another most of all. It's perfect for keeping in touch with the people who mean the most to you. FAQ Frequently Asked Questions FCC Federal Communications Commission -- Goverment agency responsible for regulation of the communications industry. FDMA Frequency Division Multiple Access -- a technique used for dividing a band of radio frequencies into individual channels that can be assigned to calls over wireless networks. AMPS, GSM, and TDMA networks all rely on FDMA in varying degrees. FEC Forward Error Correction -- a technique used in data communications to aid in detecting and correcting transmission errors. FEC methods require that redundant information be added to help compensate for possible losses and is most often used in situations where it is impractical to retransmit information damaged in transit. Firewall A system designed to prevent unauthorized access to or from a private network or computer. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized users from accessing private networks connected to the Internet, especially intranets. They are also used to prevent unauthorized access to computers using Wi-Fi networks. Forfeiture A term used in T-Mobile's EasySpeak® prepay service, referring to the act of debiting unused balance at balance expiry. See balance expiry. Forward Error Correction Also known as FEC -- a technique used in data communications to aid in detecting and correcting transmission errors. FEC methods require that redundant information be added to help compensate for possible losses and is most often used in situations where it is impractical to retransmit information damaged in transit. Frequency In communications, frequency represents the number of times an signal waveform repeats per second. Frequency is measured in Hertz (Hz). Frequency Band A frequency band is a continuous range of frequencies over which a signal waveform or carrier is allowed to vary. Frequency Division Multiple Access Also known as FDMA -- a technique used for dividing a band of radio frequencies into individual channels that can be assigned to calls over wireless networks. AMPS, GSM, and TDMA networks all rely on FDMA in varying degrees.

Index - G Back to top
	Ga, Gb, Gf, Gi, Gn, Gp, Gr, Gs Each of these designates an interface between a particular pair of components in a GPRS network. For example, Gb denotes the interface between the SGSN and a Base Station Subsystem, or BSS. Such interfaces general comprise hardware, software, protocols and control mechanisms required to move GPRS traffic from point in the system to another. Gaussian Minimum Shift Keying Also known as GMSK -- The radio signal modulation technique used in GSM-based communications today. General Packet Radio Service Also known as GPRS -- refers to a new, packet-based wireless communication service that promises data rates from 56 up to 114 Kbps and continuous connection to the Internet for wireless phone and mobile computer users. The higher data rates as well as the "always connected" mode of operation will open the door to many new, non-voice applications and services. GPRS was designed as an enhancement to GSM communications, but will probably be adapted and adopted by at least some network operators using technologies other than GSM. GHz Gigahertz -- One billion hertz. A hertz is the international unit for measuring frequency, equivalent to the older unit of cycles per second. The standard U.S. electrical power frequency is 60 Hz and wireless 802.11 LANs operate at 2.4 GHz. Gigahertz Abbreviated GHz -- One billion hertz. A hertz is the international unit for measuring frequency, equivalent to the older unit of cycles per second. The standard U.S. electrical power frequency is 60 Hz and wireless 802.11 LANs operate at 2.4 GHz. Global System for Mobile Communications Also known as GSM -- T-Mobile's wireless network uses GSM technology, which is the international digital radio standard created by the European Telecommunications Standards Institute. Developed to allow users to roam freely among markets, GSM has become the globally accepted standard since the first systems began commercial operation in 1991. In the United States, GSM-based PCS 1900 has been accepted by the American National Standards Institute (ANSI) as a standard for the PCS frequencies allocated by the Federal Communications Commission (FCC) at 1900 MHz. The GSM system accounts for approximately 55 percent of the world's wireless market, and 65 percent of the total digital wireless market. GSM's proven feature-rich, dominant digital technology and use of SIMs (also known as "smart cards") provide customers with integrated voice, high speed data, fax, paging, and text message capabilities. With full digitally encrypted wireless communications, voice and data calls are private and confidential. GSM technology offers excellent sound quality, too; independent laboratory and field-test reports validate GSM's near-wireline parity. GMSK Gaussian Minimum Shift Keying -- The radio signal modulation technique used in GSM-based communications today. GPRS General Packet Radio Service (GPRS) refers to a new, packet-based wireless communication service that promises data rates from 56 up to 114 Kbps and continuous connection to the Internet for wireless phone and mobile computer users. The higher data rates as well as the "always connected" mode of operation will open the door to many new, non-voice applications and services. GPRS was designed as an enhancement to GSM communications, but will probably be adapted and adopted by at least some network operators using technologies other than GSM. GPRS Support Node Also known as GSN -- Contains the functionality required to support GPRS. GPRS Tunneling Protocol Also known as GTP -- IP packets travelling across the GPRS backbone (the data highway within the boundaries of a particular GPRS network) are enclosed in an additional protocol "wrapper" that contains information linking the destination IP address with the IMSI or mobile subscriber identifier. This is invisible in the Internet world but essential inside the GPRS network where dynamic IP assignments are used. The technique of adding a wrapper with additional routing information is called 'tunneling', and the particular protocol used for this purpose is the GPRS tunneling protocol (GTP). GPS Global Positioning System; Global Positioning Satellite. GSM global system for mobile communications -- T-Mobile's wireless network uses GSM technology, which is the international digital radio standard created by the European Telecommunications Standards Institute. Developed to allow users to roam freely among markets, GSM has become the globally accepted standard since the first systems began commercial operation in 1991. In the United States, GSM-based PCS 1900 has been accepted by the American National Standards Institute (ANSI) as a standard for the PCS frequencies allocated by the Federal Communications Commission (FCC) at 1900 MHz. The GSM system accounts for approximately 55 percent of the world's wireless market, and 65 percent of the total digital wireless market. GSM's proven feature-rich, dominant digital technology and use of SIMs (also known as "smart cards") provide customers with integrated voice, high speed data, fax, paging, and text message capabilities. With full digitally encrypted wireless communications, voice and data calls are private and confidential. GSM technology offers excellent sound quality, too; independent laboratory and field-test reports validate GSM's near-wireline parity. GSN GPRS support node -- Contains the functionality required to support GPRS. GTP GPRS tunneling protocol -- IP packets travelling across the GPRS backbone (the data highway within the boundaries of a particular GPRS network) are enclosed in an additional protocol "wrapper" that contains information linking the destination IP address with the IMSI or mobile subscriber identifier. This is invisible in the Internet world but essential inside the GPRS network where dynamic IP assignments are used. The technique of adding a wrapper with additional routing information is called 'tunneling', and the particular protocol used for this purpose is the GPRS tunneling protocol (GTP).

Index - H Back to top
	Handheld A compact electronic device whose primary purpose is to store personal database information such as appointments, addresses, and notes. T-Mobile handhelds offer phone functionality and the ability to access information on the Internet (via either or both WAP and HTML browsers). Sometimes called "PDA" or "personal digital assistant". Handset A carryover term from wired telephony, the part of the telephone containing the transmitter and receiver, held in the hand, and used to speak and listen. In wireless, (especially in handheld, portable devices) the handset is the telephone. Hands-Free An accessory or feature that allows you to use your phone without holding it in your hand. Hands-free headsets, for example, allow you to use your hands for more important tasks--such as keeping them on the wheel while driving. HDML Handheld Markup Language -- Invented by phone.com, predecessor to WML. A variation of HTML used to write Websites that are compatible with wireless devices. See also WML and HTML. Hertz abbreviated Hz -- a unit of measurement for frequency of a cyclical waveform or repeating signal which is equal to one cycle per second. The unit of measurement is named after Heinrich Rudolf Hertz (1857-1894); a German physicist who was the first to produce radio waves artificially. High Speed Circuit-Switched Data Also known as HSCSD -- A circuit-linked technology for higher transmission speed by combining several GSM channels at the same time. This may allow speeds up to 58 bps, far faster than original GSM (9.6bps). For upload HSCSD is limited to half the speed. This technology is the predecessor of GPRS, which may deliver up to 115kbs. HLR Home Location Register -- a database that resides within a cellular network to hold current details about a subscriber, the equipment in use, the service(s) required, the user's identification encryption code, and the users "Home" cell, and what network the subscriber was last known to be using. Home Location Register Also known as HLR -- a database that resides within a cellular network to hold current details about a subscriber, the equipment in use, the service(s) required, the user's identification encryption code, and the users "Home" cell, and what network the subscriber was last known to be using. Host A computer connected directly to the Internet that provides services to other local and/or remote computers. It functions as the beginning and end of data transfers. A host is also a computer to which an expansion device attaches. When a LAN card is installed in a PC, that PC is the host to that adapter. HotSpotsm T-Mobile HotSpot provides high-speed Wi-Fi wireless Internet access in convenient public locations. Unlimited HotSpot plans start at just $19.99 per month. HSCSD High Speed Circuit-Switched Data -- A circuit-linked technology for higher transmission speed by combining several GSM channels at the same time. This may allow speeds up to 58 bps, far faster than original GSM (9.6bps). For upload HSCSD is limited to half the speed. This technology is the predecessor of GPRS, which may deliver up to 115kbs. HTML Hypertext Mark-up Language -- a standardized set of symbols and rules that, when applied during the design and set-up of a Web page, define how that page will be interpreted by a browser and appear to a viewer. Hypertext The term 'hypertext' refers to contents of a document within which individual items of information can be linked to other document sources by an orderly system of cross referencing. Today the term invariably refers to computer files available on the Internet or World Wide Web which are formatted and cross linked in prescribed ways so as to be commonly accessible and consistently presented though use of an Internet browser. Hz Hertz -- a unit of measurement for frequency of a cyclical waveform or repeating signal which is equal to one cycle per second.

Index - I Back to top
	I-AnalystTM A subscription service suited for larger businesses with multiple users, who need customized account management information. See I-Billing. I-Billing I-Billing allows quick, easy and flexible control of monthly wireless expenditures for business users. T-Mobile I-Billing is a single source electronic billing and management tool for your corporate liability wireless usage. I-Billing allows business accounts to review their monthly bill while accessing account usage reports, charts and graphs. Both new and existing T-Mobile business accounts can register for I-Billing service online. Two service options are available, I-StatementTM and I-AnalystTM. IEEE Institute of Electrical and Electronics Engineers -- A membership organization based in New York that includes engineers, scientists, and students in electronics and allied fields. It has more than 300,000 members and is involved with setting standards for computers and communications. IEEE 802.11 IEEE 802.xx is a set of specifications for LANs from the Institute of Electrical and Electronic Engineers (IEEE). 802.11 defines the standard for wireless LANs encompassing three incompatible (non-interoperable) technologies: Frequency Hopping Spread Spectrum (FHSS), Direct Sequence Spread Spectrum (DSSS), and Infrared. IMEI International mobile equipment identity -- The serial number of a GSM handset IMSI International mobile subscriber identifier -- A GSM term used to uniquely identify a subscriber to a specific carrier and country. Included Services Services included with your voice plan. These include: Text messages, built-in paging, caller ID, conference calling, call waiting and call hold, Customer Care, access to directory assistance, emergency calls, and detailed billing. Info Alerts T-Mobile info alerts are fun and informational text messages sent to your phone either daily at times you choose or by request exactly when you want them. Initial Balance Airtime balance added to account at activation (includes promotional amounts). Institute of Electrical and Electronics Engineers abbreviated IEEE -- A membership organization based in New York that includes engineers, scientists, and students in electronics and allied fields. It has more than 300,000 members and is involved with setting standards for computers and communications. International Mobile Equipment Identity   Abbreviated IMEI -- The serial number of a GSM handset. International Mobile Subscriber Identity Abbreviated IMSI -- A GSM term used to uniquely identify a subscriber to a specific carrier and country. Internet The Internet, or simply the 'Net' as it is commonly known, is a data communications network that ties together many smaller networks and individual servers, making it possible for users to access information on hundreds of thousands of participating computer sites. Internet Card A card that fits into the card slot on your PC, laptop, or PDA and allows you to connect to the Internet wirelessly. Internet Protocol Abbreviated IP -- A method or protocol by which data is sent from one computer to another on a network or over the Internet. IP provides the basis of the Internet. Internet Service Provider Abbreviated ISP -- An agency or company that provides a connection to the Internet. ISPs normally provide several means of access to their customers, including dial-up modem, DSL, and ISDN. Interworking Function, Interworking Unit An interworking unit (IWU), sometimes called an interworking function (IWF), is a wireless network component that enables communications between a computing device transmitting data over a wireless network and one normally accessible via dial-up modem over the public telephone network. The IWU provides a data bridge between a digital wireless network and the public telephone system. Intranet An intranet is a localized or enterprise-internal collection of file and application servers networked together and accessed with the aid of tools and applications originally designed for the Internet. Thus, for example, intranet users may use browsers to access information stored on the intranet servers. IP Internet protocol -- A method or protocol by which data is sent from one computer to another on a network or over the Internet. IP provides the basis of the Internet. IP address The unique number identifying a computer on the Internet, such as: 192.168.2.59. IP addresses are made up of 4 numbers between 1 and 256. Each number is separated by a dot. The IP address for http://www.T-Mobile.com is 192.168.2.59. The IP address is also known as the IP number. ISP Internet service provider -- An agency or company that provides a connection to the Internet. ISPs normally provide several means of access to their customers, including dial-up modem, DSL, and ISDN. I-StatementTM A free service geared for smaller businesses with basic account management needs. See I-Billing. iTAP Software that allows easy text input on any device with a numeric keypad. On a mobile handset, this simplification of text entry makes text messaging, e-mailing, mobile instant messaging, connecting to the Web, and performing wireless transactions easier and quicker. IWF An interworking function, sometimes called an interworking unit (IWU), is a wireless network component that enables communications between a computing device transmitting data over a wireless network and one normally accessible via dial-up modem over the public telephone network. The IWF provides a data bridge between a digital wireless network and the public telephone system. IWU An interworking unit, sometimes called an interworking function (IWF), is a wireless network component that enables communications between a computing device transmitting data over a wireless network and one normally accessible via dial-up modem over the public telephone network. The IWU provides a data bridge between a digital wireless network and the public telephone system.

Index - J Back to top
	J2ME Java 2 Platform Micro Edition, is a highly optimized, reduced size version of the Java 2 Platform designed for deployment on small devices such as cell phones and pagers. It includes both a set of APIs and a virtual machine and is designed in a modular fashion allowing scalability between a wide range of devices. Java A programming language from Sun Microsystems designed primarily for writing software for the World Wide Web. Java applets are an interpretive, dynamic language and are downloadable over the Internet. According to Sun Microsystems, "Java is a simple, object-oriented, distributed, interpreted, robust, secure, architecture-neutral, portable, multithreaded, dynamic, buzzword-compliant, general-purpose programming language".

Index - K Back to top
	Kb Kilobit -- a term denoting 1024 bits KB Kilobyte -- a term denoting 1024 bytes, roughly equal to 8 kilobits Kbps Kilobits Per Second -- a measure of data transfer speed KHz Kilohertz -- a unit of measurement for frequency equal to 1000 Hertz Kilobit Abbreviated Kb -- a term denoting 1024 bits Kilobits Per Second Abbreviated kbps -- a measure of data transfer speed Kilobyte Abbreviated KB -- a term denoting 1024 bytes, roughly equal to 8 kilobits Kilohertz Abbreviated KHz -- a unit of measurement for frequency equal to 1000 Hertz

Index - L Back to top
	LAN Local Area Network -- A communications network that serves users within a confined geographical area, such as an office, a building, or campus. A LAN consists of servers, workstations, a network operating system, and a communications link. landline Traditional telephone service provided on copper circuits or other circuits which are land-based (either aerial, buried, or trans-oceanic) Lawful Interception Gateway Also known as LIG, the lawful interception gateway provides a mechanism whereby designated security or law enforcement agencies can intercept GPRS traffic, much as "wiretap" facilities are provided in voice networks. Legal authority to use this mechanism as well as safeguards to protect privacy will vary from country to country. LIG The Lawful Interception Gateway provides a mechanism whereby designated security or law enforcement agencies can intercept GPRS traffic, much as "wiretap" facilities are provided in voice networks. Legal authority to use this mechanism as well as safeguards to protect privacy will vary from country to country. LNP Local Number Portability The ability of subscribers to switch local or wireless carriers while retaining the telephone number from the original carrier. Local Area Network Abbreviated LAN -- A communications network that serves users within a confined geographical area, such as an office, a building, or campus. A LAN consists of servers, workstations, a network operating system, and a communications link. Local Service Area Much like a "home calling area", a customer can get unlimited access in all locations within a specific local area (e.g. Dallas/Fort Worth, New York City, San Francisco Bay Area, etc.). Usage outside of the customer's local service area is rated at $0.15/minute.

Index - M Back to top
	Mb Megabit -- a term denoting approximately one million bits. There is some argument as to whether a megabit should signify one million bits or 1,048,576 bits since the latter number more closely adheres to the binary arithmetic that lies at the heart of computer technology. On the other hand "mega" has long signified one million in the decimal system and is most widely understood in this way. MB Megabyte -- a standard measure of data size. A megabyte is equal to 1024 kilobytes(KB). Mbps Megabits Per Second -- the rate of transfer of data as measured in megabits. Megabit Abbreviated Mb -- a term denoting approximately one million bits. There is some argument as to whether a megabit should signify one million bits or 1,048,576 bits since the latter number more closely adheres to the binary arithmetic that lies at the heart of computer technology. On the other hand "mega" has long signified one million in the decimal system and is most widely understood in this way. Megabits Per Second Abbreviated Mbps -- the rate of transfer of data as measured in megabits. Megabyte Abbreviated MB -- a standard measure of data size. A megabyte is equal to 1024 kilobytes (KB). Megahertz Abbreviated MHz -- In wireless communications, a unit of radio frequency measurement equal to one million Hertz. In computers, megahertz is used to mean one million clock cycles per second. MegaTonessm Advanced polyphonic RingTones that sound like real music, not just electronic beeps. Message-Waiting Indicators Small icons that appear on your phone's screen to tell you that you have a message waiting. MHz Megahertz -- In wireless communications, a unit of radio frequency measurement equal to one million Hertz. In computers, megahertz is used to mean one million clock cycles per second. MMS Multi-Media Messaging Service -- similar to text messaging, but with higher bandwidth capabilities. This technology is used to send text, audio, and graphics to mobile phones. Mobile Station Abbreviated MS -- A mobile transceiver or mobile radio enabled device operating within a mobile network. Originally this term referred just to cell phones or handsets, but now includes mobile radio modems or any device containing a mobile radio modem as well. Mobile Station ISDN Abbreviated MSISDN -- mobile station ISDN (integrated services digital network) number (commonly known as mobile number). In this practice, the number to dial to set a call toward the corresponding subscriber. A subscriber may have several MSISDNs, corresponding to different services. Mobile Telephone Switching Office Abbreviated MTSO -- The central switching system that monitors and controls all wireless system operations, including placement of calls, tracking the location, movement and handoff of phones traveling within the system, and tracking billing information. Mobile To Mobile Minutes Minutes used on calls between T-Mobile phones. Both the caller and the receiver must be T-Mobile subscribers and on the T-Mobile network. Note: Mobile-to-Mobile calls made or received on Edge Wireless, Colorado Cellular or Cingular networks within Colorado, Maine, Nebraska, New Hampshire, New York, North Carolina, South Carolina and Vermont will not be rated as Mobile-to-Mobile. Additional charges may apply to international calls. Modem A device which converts digital signals generated by a computer into analog signals for transmission over telephone lines, and then convert the same analog signal into a digital signal so that it may be used by the receiving computer. The term modem is short for modulator-demodulator. Modulation A process by which information (e.g. voice, music, data) is added to a carrier signal, such that the signal receiver can extract the information via a process called de-modulation. Three commonly used modulation techniques are Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM). Monthly Access   The dollar amount that customers pay for access to the network each month. MS Mobile Station -- A mobile transceiver or mobile radio enabled device operating within a mobile network. Originally this term referred just to cell phones or handsets, but now includes mobile radio modems or any device containing a mobile radio modem as well. MSISDN Mobile Station ISDN (integrated services digital network) number (commonly known as mobile number). In this practice, the number to dial to set a call toward the corresponding subscriber. A subscriber may have several MSISDNs, corresponding to different services. MTSO Mobile Telephone Switching Office -- The central switching system that monitors and controls all wireless system operations, including placement of calls, tracking the location, movement and handoff of phones traveling within the system, and tracking billing information. Multi-Band Certain "multi-band" mobile stations can operate over two or more of the frequency bands commonly used by network operators (800MHz , 900MHz, 1800MHz, and 1900MHz). The selection of frequency band may be automatic, or user-controlled. In the United States, only the 800 and 1900 bands are used for cellular services, while 900MHz service is found in Asia and 1900 MHz service predominates in Europe. Multi-Media Messaging Service Abbreviated MMS -- similar to text messaging, but with higher bandwidth capabilities. This technology is used to send text, audio, and graphics to mobile phones. Multi-Mode Certain "multi-mode" handsets can operate over more than one wireless technology (GSM, CDMA, TDMA, and AMPS). Dual mode AMPS/CDMA phones and AMPS/TDMA phones are still generally available from the original cellular network operators who continue to offer AMPS services in tandem with the newer digital network technologies. Multiple Access Techniques used in wireless telecommunication systems that permit sharing of limited radio frequency resources among a large numbers of potential users, not all of whom will require simultaneous access. The key assumption is that not all users will require simultaneous access. All the common wireless technologies, including CDMA, FDMA, GSM, and TDMA, apply these techniques. My Bill Detailed billing information available online in My T-Mobile. My E-mail Now you can stay in touch wherever you are. Instantly access your e-mail from the convenience of your wireless phone, handheld, or PC. Send, receive, and reply to corporate and personal e-mail with My E-mail. My E-mail supports all POP3 based e-mail accounts. (Earthlink™, NetZero®, Juno®, and Mindspring™). My T-Mobile Web page where a customer can get information on their bill, send text messages, and manage their account.

Index - N Back to top
	NAT (network address translation) The translation of an Internet Protocol address used within one network to a different IP address known within another network. Netmask A system for designating hierarchies of networks and sub-networks within the Internet has evolved that uses netmasking to simplify routing and local network administration. The purpose of a netmask is to specify which part of an IP address specifies a specific host and which part designates a subnet to which the host belongs. Network Two or more computers connected together in order to share resources. NSS (network switching subsystem) The network switching subsystem (NSS) refers to that part of a GSM network primarily responsible for interconnection to the Public Service Telephone Network (PSTN), collecting charging information, maintaining subscriber profile and service information, wide area mobility management etc. The principal components are the MSC, or switch, the Home Location Register (HLR) and the Visitor Location Register (VLR).

Index - O Back to top
	Off Peak The time after the business day that wireless carriers may offer airtime at reduced rates. Optional Services Services you may wish to add to your voice or data plan, such as Roadside Assistance, BuddyTimesm, and Text Messaging upgrade. OSI Open Systems Interconnection -- a standard description or "reference model" for how messages should be transmitted between any two points in a telecommunication network. Its purpose is to guide product implementers so that their products will consistently work with other products. The reference model defines seven layers of functions that take place at each end of a communication. Although OSI is not always strictly adhered to in terms of keeping related functions together in a well-defined layer, many if not most products involved in telecommunication make an attempt to describe themselves in relation to the OSI model. It is also valuable as a single reference view of communication that furnishes everyone a common ground for education and discussion. OTA Over The Air -- T-Mobile handsets are activated differently than traditional cellular telephones. Physical programming of a PCS telephone (usually performed in the retail store where purchased) is not necessary; instead, the programming is done over the air, electronically. Outage A total and complete interruption of service. Over The Air Abbreviated OTA -- T-Mobile handsets are activated differently than traditional cellular telephones. Physical programming of a PCS telephone (usually performed in the retail store where purchased) is not necessary; instead, the programming is done over the air, electronically. Overage Your T-Mobile voice plan includes a number of minutes. If you use more, you pay an overage fee per minute. Data plans include a set amount of data transfer. If you use more, you pay an overage fee per megabyte of data.

Index - P Back to top
	Packages Our most popular plans, phones, and features bundled for your convenience. Packet When a quantity of data is to be transmitted over a network, it is sometimes divided into groupings of sequential bits called packets. Communications and error control information is then added to the packet prior to actual transmission. At the data destination, the extra control information is removed and the original information is reconstructed from the individual packets. Packet Data Protocol Abbreviated PDP -- the primary protocol(s) used for packet data communications on a packet data network, for example TCP/IP on the Internet. PAN Personal Area Networks -- A personal network between your devices, for example between your computer and your mobile phone. Bluetooth® is one technology enabling this. Paperless Bill Paperless Billing is notification by e-mail that your bill is ready online. Then, you can log in to My T-Mobile and pay your bill online in minutes. There is no cost to have Paperless Billing. Past Due Customer A customer is considered past due when any dollar amount is carrying past 30 days or more. PCC Prepaid Customer Care PC Card A card that fits into the card slot on your PC, laptop, or handheld and allows you to connect to the Internet wirelessly. Also called a network card. PCMCIA (Personal Computer Memory Card International Association ) Card A credit-card sized device that was originally designed as a platform for add-on memory for portable computers, but later expanded to include a wide range of peripherals including pagers and radio modems. PCS Personal Communication Service -- commonly known as digital wireless service PCS Message Center T-Mobile's Web-based text messaging utility is located at http://www.t-mobile.com/messaging/. The service sends short text messages to handsets on the T-Mobile network. Users can send a single, 140-character text message to up to 10 people at once. You can also send text messages to T-Mobile subscribers via e-mail using the following address: 4255551212@tmomail.net, where 425-555-1212 is the subscriber's wireless number. PDA Personal Digital Assistant -- A compact electronic device whose primary purpose is to store personal database information such as appointments, addresses, and notes. PDA devices may be marketed with phone functionality and the ability to access information on the Internet (either or both WAP and HTML browsers). PDC Personal Digital Cellular -- A Japanese standard for digital mobile telephony (800 MHz and 1500 MHz bands). PDF Portable Document File PDP Packet Data Protocol -- the primary protocol(s) used for packet data communications on a packet data network, for example TCP/IP on the Internet. PDP context In order to use a GPRS network, the MS and the network must negotiate a set of parameters that support the flow data traffic to and from the MS in an orderly fashion. Among the parameters that must be set are: the identifier of the external packet data network the MS wishes to communicate with, a PDP address recognized in that network (for example, an IP address for service over the Internet), the address of the GGSN, QoS and so forth. The set of these parameters taken together is called a PDP context. Individual parameters may change over the life of the context as the MS moves about the network. Likewise an MS may have several contexts active at one time so as to be able to simultaneously set up and maintain sessions in more than one network, for example the Internet and a corporate intranet. Peak The time of the business day (between 7:00 am and 9:00 p.m.) when a wireless system carries the most traffic and customers can expect to pay the full-service rate Personal Identity Number abbreviated PIN -- A password of several digits used in relation with smart cards. Phase-Shift Keying Abbreviated PSK -- is a method of modulating a carrier signal by rapidly changing or shifting the signal wave phase as a method of sending information. Patterns of 1's and 0's can be sent via prescribed phase shifts. PHS (Personal Handyphone System) Digital mobile telephone system according to Japanese standard (1900Mhz). Picture Messagesm Similar to a text message, but sent using the multi-media messaging service (MMS) for higher bandwidth capabilites. You can take a picture with your camera phone and send it wirelessly from your phone to any e-mail address. PIM Personal Information Management -- applications that provide an individual with support for organizing and storing personal and business related information. These applications may take the form of schedulers (e.g.: Outlook), address books, notepads, to do lists, etc. PIN Personal Identity Number -- A password of several digits used in relation with smart cards. PIN Unlocking Key   Abbreviated PUK -- An 8-digit number used when a subscriber has erroneously entered in their PIN three times. This code is unique to a SIM or smart card (versus a handset). Ping Packet Internet Grouper -- A diagnostic utility program that checks to see if a server is available and is functioning. The Ping command also returns a Web site's IP Address; you can obtain T-Mobile.com's IP Address by issuing a Ping command from the Run dialog in the Windows Start Menu. Pooling Plan A rate plan where two or more lines share a set pool of minutes. T-Mobile offers FamilyTime® plans as well as small business pooling plans. POP3 A protocol used to retrieve e-mail from a server. EarthlinkTM, NetZero®, Juno®, and MindspringTM are all examples of POP3-based e-mail services. POP3 stands for "Post Office Protocol, Version 3". Port Number TCP and UDP provide an address mechanism, the port number, for identifying different applications communicating from the same IP address. Thus an active Web browser and an independently active mail program operating from the same IP location would typically use different port numbers so that packets are correctly delivered to specific applications. Portal In the World Wide Web, a Web site that is or proposes to be a major starting site for users when they establish a session with the Web, or a site that visitors repeatedly visit as an anchor site. Portal sites often have a catalogue of links, a search engine, free e-mail, and other services to entice people to use that site as their point of entry to the Web. Post-Paid Cellular A type of service plan which is billed after the service has been provided, usually monthly. See prepaid cellular Premium Handset Protection Premium Handset Protection provides protection against malfunctions or failures due to defects in materials or workmanship or normal wear and tear during and after the manufacturer's warranty period. The service contract, provided by Asurion, ensures that you are reconnected quickly and conveniently. Prepaid Cellular A service plan, such as T-Mobile's EasySpeak® requiring subscribers to pay for wireless services in advance. Prepaid Cellular is generally used by customers with negative credit histories, people wanting to adhere to a budget, and those using wireless service on a limited basis. T-Mobile offers customers a variety of prepay and post-pay service plans. Primary Account Holder Subscriber on the account who is responsible for the bill and for setting online account management permissions for other phones on the account. Prorate A proportional charge relating to the amount of service a customer uses; for example, you are only charged monthly access for the days a particular service was available to you. Protocol A collection of rules that ensure the compatibility of the transmitting and receiving equipment. Protocols usually have 3 main parts: 1) the method by which the data are encoded, 2) the method by which the codes are received, and 3) the method used to establish control, detect errors and failures, and initiate corrective action. Provisioning A process of activating the subscriber's wireless telephone on the network and assigning services to a subscriber. Provisioning includes: acquiring the subscriber's new telephone number; acquiring the subscriber identity module (SIM) number, the electronic serial number (ESN), and the international mobile subscriber identifier (IMSI) number; and setup of the subscriber's feature set, including call forwarding, voice mail, three-way calling, Caller ID, text messaging, and other features provided by the wireless company. Proxy In an enterprise that uses the Internet, a proxy server is a server that acts as an intermediary between a workstation user and the Internet so that the enterprise can ensure security, administrative control, and caching service. PSK Phase-Shift Keying -- a method of modulating a carrier signal by rapidly changing or shifting the signal wave phase as a method of sending information. Patterns of 1's and 0's can be sent via prescribed phase shifts. PUK PIN unlocking key -- An 8-digit number used when a subscriber has erroneously entered in their PIN three times. This code is unique to a SIM or smart card (versus a handset).

Index - Q Back to top
	QAM Quadrature Amplitude Modulation -- A modulation technique, using variations in both signal amplitude and phase to convey information. This technique allows up to 128 data-encoded symbols to be represented per hertz (signal cycle). Quadrature Amplitude Modulation Abbreviated QAM -- A modulation technique, using variations in both signal amplitude and phase to convey information. This technique allows up to 128 data-encoded symbols to be represented per hertz (signal cycle). QWERTY A standard typewriter keyboard.

Index - R Back to top
	RA Routing Area -- For purposes of GPRS mobility management the concept of routing area has been added to the basic concepts of GSM. It can be thought of as an IP subnetwork and is always served by just one SGSN. Radio Frequency Abbreviated RF -- A generic term for radio-based technology. The international unit for measuring radio frequency is Hertz (Hz), which is equivalent to the older unit of cycles per second. RADIUS (Remote Authentication Dial-In User Service) Radius refers to a client/server technique that enables remote access servers (RAS) to communicate with a central server, the Radius server, to authenticate dial-in users and authorize their access to the requested system or service. RAI Routing Area Identifier-- Each routing area is assigned an identifier (RAI) by the network and is broadcast over the area by the network. A GPRS mobile station monitors the broadcast RAI, and when an RA border has been crossed, it must notify the network that it has moved to a new routing area. Range A linear measure of the distance that a transmitter can send a signal. RAS A remote access server handles users seeking access to network from a remote or outside location. It may provide gateway/bridge functions between the PSTN or Internet and an enterprise internal network. It also provides authentication services to prevent unauthorized parties from gaining access to the network it serves. Rate Plan A contract between a wireless carrier and a wireless subscriber that details the terms of the wireless service including activation fees, access charges, and per-minute usage. Rate plans provide cost-effective pricing for different types and amounts-of-usage by the subscriber. T-Mobile has a variety of voice, data, and voice/data plans available. Recharge Adding airtime to a T-Mobile To Go prepaid account. Prepaid customers may recharge (increase the balance on an account) in increments of $10, $25, $50, and $100 dollars, using credit/debit cards, electronic check or a T-Mobile To Go refill card. Subscribers may recharge accounts through the Interactive Voice Response (IVR) system, T-Mobile.com, My T-Mobile or with help from a Customer Service Representative (CSR). See also refill and refresh. Refill Adding airtime to a T-Mobile To Go prepaid account. Prepaid customers may recharge (increase the balance on an account) in increments of $10, $25, $50, and $100 dollars, using credit/debit cards, electronic check or a T-Mobile To Go refill card. Subscribers may recharge accounts through the Interactive Voice Response (IVR) system, T-Mobile.com, My T-Mobile or with help from a Customer Service Representative (CSR). See also recharge and refresh. Refresh Adding airtime to a T-Mobile To Go prepaid account. Prepaid customers may recharge (increase the balance on an account) in increments of $10, $25, $50, and $100 dollars, using credit/debit cards, electronic check or a T-Mobile To Go refill card. Subscribers may recharge accounts through the Interactive Voice Response (IVR) system, T-Mobile.com, My T-Mobile or with help from a Customer Service Representative (CSR). See also recharge and refill. Regional Plan A calling plan for people who make most of their calls from near their home. With a regional calling plan you receive free digital roaming and free long distance in your home area. Regulatory Programs Fee We elect to collect and retain this Fee to help recover a portion of our costs incurred to satisfy certain federal government mandates and programs related to customers, including, without limit, wireless number pooling, local number portability and E911. We may impose the Fee whether or not all or some services are used, or available to you, or in your location. Remote Access Server abbreviated RAS -- A remote access server handles users seeking access to network from a remote or outside location. It may provide gateway/bridge functions between the PSTN or Internet and an enterprise internal network. It also provides authentication services to prevent unauthorized parties from gaining access to the network it serves. RF radio frequency -- A generic term for radio-based technology. The international unit for measuring radio frequency is Hertz (Hz), which is equivalent to the older unit of cycles per second. RIM® Makers of the BlackBerry handhelds, end-to-end wireless e-mail solutions with integrated phones. RingTones Make your phone your own with a custom ring! You can download RingTones online at My T-Mobile. Roaming Feature of the system enabling subscribers to obtain service from other PLMNs than the one they have a subscription. Means that your mobile phone automatically sets up communication procedures with different radio base stations when you are on the move. International roaming means that you can use networks other than your own when travelling abroad. Some phones allow for example switching between 900/1800 in Europe to 1900 in US. Round-Up Calls Partial minutes used are rounded up and charged, or deducted from any allocated minutes, as full minutes; calls and sessions are measured from the time the Network begins to process the call (before the phone rings or the call is answered) through its termination of the call. For purposes of time or day rating, an entire call is rated from when the call starts. Routing Area abbreviated RA -- For purposes of GPRS mobility management the concept of routing area has been added to the basic concepts of GSM. It can be thought of as an IP subnetwork and is always served by just one SGSN. Routing Area Identifier Each routing area is assigned an identifier (RAI) by the network and is broadcast over the area by the network. A GPRS mobile station monitors the broadcast RAI, and when an RA border has been crossed, it must notify the network that it has moved to a new routing area.

Index - S Back to top
	Screen Saver Screen savers are the graphics that replace your phone's main screen after a few seconds of inactivity. Some phones support animated screen savers. Customize your phone by downloading screen savers at My T-Mobile. Secure Server A network-accessible computer that uses SSL (secure socket layers) for encryption to allow private online transactions. Encryption protects on online shopper's credit or debit card and other personal information from being compromised during e-commerce transactions. Secure Socket Layer Abbreviated SSL -- A protocol for transmitting private documents via the Internet. SSL works by using a private key to encrypt data that's transferred over the SSL connection. Web sites use the protocol to obtain confidential user information, such as credit card numbers. By convention, Web pages that require an SSL connection start with https:// instead of http//: Security Code A passcode in the handset required to access certain services. You can change your security code to something easy to remember. Serial Cable A cable used to connect devices through a computer's serial port. Serial Port Also known as a communications port or COM port. The serial port is a location for sending and receiving serial data transmissions. Service Level Agreement A verbal or written understanding between a user and a service provider that defines: a) the services to be provided, and b) the metrics used to compare the agreed-level-of-service to the actual service provided. A service level agreement (commonly abbreviated SLA) may include guidelines and time windows for notification, response, escalation, and resolution; other guidelines, such as average level of service, average and maximum outage duration, and response times also may be stipulated within the agreement. Service Package Another name for your wireless package -- a group of services offered together. Service Plan A contract between a wireless carrier and a wireless subscriber that details the terms of the wireless service including rates for activation, access charges, and per-minute usage. T-Mobile has a variety of voice, data, and voice/data plans available. Service Set Identifier Abbreviated SSID -- A common identifier shared by all computers on the same wireless LAN. SET Secure Electronic Transaction -- a system for ensuring the security of financial transactions over the Internet. SET may authenticate both user and merchant in order to approve the transaction. SGML Standardised Generalised Markup Language. The mother of all markup languages. XML is "SGML light". HTML is a loose application of SGML. SGSN The serving GPRS support node connects one or more BSCs to the GPRS backbone network, providing IP connectivity to the GGSN on the one hand and converting IP traffic to and from the formats and protocols used by the base station subsystem or BSS. Short Message Service Abbreviated SMS -- a technology used to send text messages to mobile phones. Also called text messaging. SIM Subscriber Identity Modules. Also known as a smart card. This chip resides in GSM handsets and identifies the caller to the mobile network as a legitimate subscriber. The module stores a mathematical algorithm that encrypts voice and data transmissions, making it nearly impossible to listen to the call or intercept data. You can transfer you SIM from phone to phone, retaining your phonebook and personalized service information. Smart Card Also called a subscriber identity module (SIM). This chip resides in GSM handsets and identifies the caller to the mobile network as a legitimate subscriber. The module stores a mathematical algorithm that encrypts voice and data transmissions, making it nearly impossible to listen to the call or intercept data. You can transfer you SIM from phone to phone, retaining your phonebook and personalized service information. SMS Short Messaging Service -- a technology used to send text messages to mobile phones. Also called text messaging. SMTP Short Message Transfer Protocol Soft Key A key immediately beneath your phone's screen that performs the function currently listed on the screen. Its function changes depending on the context in which it is called. Spread Spectrum A radio transmission technology that "spreads" the user information over a much wider bandwidth than otherwise required in order to gain benefits such as improved interference tolerance and unlicensed operation. SSID Service Set Identifier -- A common identifier shared by all computers on the same wireless LAN SSL Secure Socket Layer -- A protocol for transmitting private documents via the Internet. SSL works by using a private key to encrypt data that's transferred over the SSL connection. Web sites use the protocol to obtain confidential user information, such as credit card numbers. By convention, Web pages that require an SSL connection start with https:// instead of http//: Standby Time The amount of time you can expect your phone to maintain power on a single standard battery charge. Talking on the phone uses more power and reduces the amount of standby time between charges. Subscriber A person or organization that agrees to pay for telephone service; a customer. Users and subscribers are not always the same: a user actually uses the service (makes calls, takes calls, and exchanges data), and may or may not be the subscriber. Subscriber Identity Module Abbreviated SIM, also known as a smart card -- This chip resides in GSM handsets and identifies the caller to the mobile network as a legitimate subscriber. The module stores a mathematical algorithm that encrypts voice and data transmissions, making it nearly impossible to listen to the call or intercept data. You can transfer you SIM from phone to phone, retaining your phonebook and personalized service information. Summary Paper Bill You can opt to receive a free, paper summary of your bill instead of a multi-page statement. This statement gives you a quick, accurate overview of service charges and the amount due. Sync Abbreviation of synchronization. Many T-Mobile devices can sync with your PC to update e-mail, calendars, and to-do lists.

Index - T Back to top
	T1 A leased, point-to-point digital circuit capable of carrying voice and data at 1,544,000 bits per second. T9 Predictive Text input Software that enables users to easily enter text into small devices with limited size keyboards, like mobile phones. T9 Text Input replaces the traditional "multi-tap" method of entering text providing the ability to enter text using only one keystroke per letter. Take Control T-Mobile Take Control gives you the confidence to use your phone whenever you want without worrying about surprise wireless bills. That's because with Take Control plans, you do not incur voice overage charges. Take Control plans alert you when you're running out of monthly Whenever minutes, then stop you from going over. You decide if you want to buy additional Whenever minutes – simply top up by purchasing prepaid minutes (just 10 cents per minute) - or you can wait until your next month's plan minutes start. Talk Time The amount of time you can expect to actively use your phone on a single standard battery charge. Talk time varies according to signal strength. Tariff Documents filed by a telecommunications service provider with a state public utility commission or the Federal Communications Commission (FCC). The tariff, a public document, details the services, equipment, and pricing offered by the provider Taxes, Fees and Surcharges This section includes applicable federal, state and local taxes, fees and surcharges that have been imposed on you or us for your service. We collect these taxes, fees and surcharges and, unless otherwise noted, remit them to the appropriate governmental entity. TCP Transmission Control Protocol -- A protocol used with the Internet Protocol (IP) to send data in the form of individual units called packets between computers over the Internet. While IP takes care of handling the actual delivery of the data, TCP keeps track of the packets that a message is divided into for efficient routing through the Internet. TCP/IP Transmission Control Protocol (TCP), and Internet Protocol (IP) together define the basic rules for how information is transmitted across the Internet (as well as on most LANs) in packetized form. Text Messaging Short messages that can be sent from and received on your phone. You can communicate whenever, wherever, and with anyone who has a wireless phone or an e-mail address. TID (Tunnel ID) Packets traveling along the GPRS backbone are 'wrapped' inside an additional addressing layer to form GTP packets. Each GTP carries a TID or tunneling identifier which tells the SGSN and GGSN whose IP packet is contained inside. In affect it associates the IP address of the packet with the ISMI. T-Mobile.com Web-based homepage for T-Mobile USA. Visitors and subscribers can view T-Mobile's product and service offerings; view regional, national and international coverage areas; make purchases from the T-Mobile Online Store; send e-mail to Customer Care, view their itemized calls and account balances, update their handset's phonebook, and more. T-Mobile Internet The wireless data network from T-Mobile. It enables you to access information on your phone, or send e-mail and access the Internet on your laptop or handheld wirelessly across every T-Mobile coverage area. Your connection to the T-Mobile Internet network is always on when your phone, laptop, or handheld is on, so no more dialing and waiting for a connection. T-Mobile Internet Accelerator The T-Mobile Internet Accelerator Service is a clientless Web accelerator solution, which speeds up the wireless Web browsing experience via the T-Mobile Internet Network by optimizing and compressing the content of the Web pages. No software installation or configuration on the client machine is needed in order to use the service. T-Mobile To Go T-Mobile's Pay As You Go wireless plan. T-Mobile To Go is the hassle-free way to stay connected. No long-term contract. No credit check. No deposits or monthly bills. Just a phone and as many or few minutes as you want. Pay As You Go, then talk, talk, talk. T-Mobile USA One of the fastest growing nationwide wireless service providers, offering all-digital voice, messaging, and high-speed wireless data services to over 10 million customers. T-Mobile USA is a member of the T-Mobile International group, the mobile telecommunications subsidiary of Deutsche Telekom AG (NYSE:DT). Tmomail T-Mobile's proprietary Internet-based e-mail system for PCS text messaging. Every T-Mobile telephone has an Internet address, enabling messages of up to 140 characters to be sent directly to the subscriber's handset. The text messaging utility is located at http://www.t-mobile.com/messaging/. Transmission Control Protocol Abbreviated TCP -- A protocol used with the Internet Protocol (IP) to send data in the form of individual units called packets between computers over the Internet. While IP takes care of handling the actual delivery of the data, TCP keeps track of the packets that a message is divided into for efficient routing through the Internet. Tri-Band Tri-band mobile phones can work on networks operating on three different frequency bands (GSM 900, 1800, and 1900) allowing you full coverage in Europe, America and Asia. T-Zones Get more from your phone with t-zones. t-zones service lets you send photos to any e-mail address, access the mobile Web, and more! T-Zones Enabled Devices that are capable of using t-zones. T-Zones Mobile Web The Internet on your t-zones phone. Make your life easier and more fun too, with multi-player games, movie news, a 24-hour sports desk, restaurant and nightclub guide, weather forecaster and more.

Index - U Back to top
	UA User Agent -- Software that interprets WML, WMLScript, WTAI and other forms of code. (Explorer, Netscape and Opera are examples of UAs) UDP User Datagram Protocol -- used to provide fast data transfer between two IP endpoints; not as reliable a method as TCP. UMTS Universal Mobile Telecommunications System -- the third generation mobile telephone standard in Europe. Also described as 3G. Universal Mobile Telecommunications System abbreviated UMTS -- the third generation mobile telephone standard in Europe. Also described as 3G. Universal Service Assessments Although not referenced as taxes, these government assessments imposed directly on you or us. The charges we collect are remitted, in the form of contributions, to federal and state funds related to universal service. These funds generally support telecommunications services in high-cost areas, for low-income customers, or for specialized users such as schools and rural health care providers. These charges may change as the funds' contribution rates are changed by the appropriate government agency. Uplink Most data-communication connections are bi-directional. The direction toward the remote user is referred to as the "downlink". The direction away from the remote user is referred as the "uplink". URL Uniform Resource Locator -- A combination of a protocol (such as http://), host name, port (optional), path, and resource name. The URL uniquely identifies a resource on the Internet. USB Cable A cable allowing a connection between peripheral devices and computers. USB is a more flexible interface standard than the older serial port and supports data transfer rates of 12 Mbps. A single USB port can be used to connect up to 127 peripheral devices. USB Port A location for connecting peripheral devices and computers. USB is a more flexible interface standard than the older serial port and supports data transfer rates of 12 Mbps. A single USB port can be used to connect up to 127 peripheral devices.

Index - V Back to top
	VGA Refers to the resolution size of the images a camera phone captures. VGA is 640 x 480 resolution. VGA resolution is suggested for phone-to-Web and phone-to-e-mail applications. See also CIF. Vibrating Alert Your phone will vibrate to notify you of incoming calls and messages. Video Messaging Take a short video with your video phone and send it wirelessly from your phone to any e-mail address. Virtual Private Network abbreviated VPN -- a non-public connection between two computers that sends private corporate data over a shared or public network such as the Internet. VPNs can also be used to give subscribers, clients, and consultants access to corporate resources with security features that can include encryption, authentication, and tunneling. VoiceDial, Voice-Activated Dialing A feature that allows you to place calls hands free to selected preprogrammed numbers. VoiceMail T-Mobile's VoiceMail system will take your calls for you when you are unavailable, busy and even when your phone is powered off. VOIP (Voice Over Internet Protocol) Describes the process of transmitting voice via data IP packages. VPN Virtual Private Network -- a non-public connection between two computers that sends private corporate data over a shared or public network such as the Internet. VPNs can also be used to give subscribers, clients, and consultants access to corporate resources with security features that can include encryption, authentication, and tunneling.

Index - W Back to top
	W3C The World Wide Web Consortium, or W3C, is an Internet industry group created to develop, monitor, and promote technical standards that increase the functionality of the Web. WAE Wireless Application Environment -- an environment that allows operators and service providers to build applications and services that can reach a wide variety of different platforms. WAE is part of the wireless application protocol (WAP). Wallpaper Wallpaper graphics turn ordinary backgrounds into extraordinary phone screens! Some phones support animated wallpaper. WAN wide area network -- A communications system used to connect computers and other devices across a large area. WAP Wireless Application Protocol -- This technology standard formats Internet data so that it can be sent to and read by mobile devices. Overcoming the constraints of (relatively) slow and intermittent nature of wireless links for mobile communications, together with the limited screen size and computing power of mobile devices, is the central goal of WAP technology. See also WML. WAP Application A WAP compatible/accessible Web-based application. WAP Bookmark A Web address for a WAP compatible Web site or page. WAP Browser A browser designed to run on mobile computing or communications devices that adheres to WAP standards and gives the user access to WAP services and WAP-compatible Web sites. WAP Forum The WAP Forum is the industry association comprising over 500 members that has developed the WAP standard for wireless information and telephony services on digital mobile phones and other wireless terminals. Founding members include Nokia, Ericsson, Motorola, and Phone.com. WAP Gateway A wireless network element that mediates the transfer of WAP compatible information between wireless networks and the Web. The gateway bridges the differences between the worlds of wired and wireless information exchange. WAP Server A Web server supporting WAP compatible applications, content, and services. The computer programmers use WML instead of HTML. WAP Service Bearer Any of several wireless communication access methods that may be used to support WAP based services. Short message service (SMS), circuit-switched data service (CSD) and general packet radio service (GPRS) can be used as WAP service bearers in GSM networks. WDP Wireless datagram protocol Web An informal term commonly used to replace 'World Wide Web'. Web-Enabled Devices that are capable of connecting to the Internet. Web Page A Web accessible file that can be interpreted by a browser. Web Server A publicly accessible computer that acts as a repository for hypertext files, Internet applications and the like and which makes these files available on an interactive basis via the Web. WECA Wireless Ethernet Compatibility Alliance -- WECA's mission is to certify interoperability of Wi-Fi 802.11 products and to promote Wi-Fi as the global wireless LAN standard across all market segments. Weekend Minutes Minutes used between 12:00AM Saturday and 11:59PM Sunday, local standard time. Weeknight Minutes Weeknight Minutes An optional add-on service that offers unlimited minutes between 9:00 pm to 6:59 am local time Monday through Friday. Whenever Minutes Minutes that can be used at anytime and anywhere on the nationwide GSM network. Wide Area Network abbreviated WAN -- A communications system used to connect computers and other devices across a large area. Wi-Fi Wi-Fi, or wireless fidelity, is a term that is used generically to refer to any product or service using any type of 802.11 technology. Wi-Fi networks operate in the unlicensed 2.4 and 5 GHz radio bands, with an 11 Mbps (802.11b) or 54 Mbps (802.11a) data rate, respectively. Wi-Fi enabled devices (laptops or PDAs) can send and receive data wirelessly from any location equipped with Wi-Fi access. Wireless Using the radio-frequency spectrum for transmitting and receiving voice, data, and video signals Wireless Application Environment abbreviated WAE -- an environment that allows operators and service providers to build applications and services that can reach a wide variety of different platforms. WAE is part of the wireless application protocol (WAP) Wireless Application Protocol Abbreviated WAP -- This technology standard formats Internet data so that it can be sent to and read by mobile devices. Overcoming the constraints of (relatively) slow and intermittent nature of wireless links for mobile communications, together with the limited screen size and computing power of mobile devices, is the central goal of WAP technology. See also WML. Wireless Business Solutions Directory A directory of third-party enterprise applications available for T-Mobile devices. Wireless Carrier A company that provides wireless communications services to subscribers. Wireless E-mail The transfer of information/data received or sent from a wireless device to or from the network. Wireless Ethernet Compatibility Alliance Abbreviated WECA -- WECA's mission is to certify interoperability of Wi-Fi 802.11 products and to promote Wi-Fi as the global wireless LAN standard across all market segments. Wireless Internet Service Provider Abbreviated WISP -- Like a traditional Internet service provider (ISP), a WISP provides access to the Internet to its customers for a fee. A WISP provides a wireless connection and provides faster speeds than a dial-up connection. Wireless Local Area Network Abbreviated WLAN -- A flexible data communication system implemented as an extension to or as an alternative for a wired LAN within a building or campus. Using electromagnetic waves, WLANs transmit and receive data over the air, minimizing the need for wired connections. Wireless Local Number Portability Abbreviated WLNP -- The ability of wireless telephone customers to retain their existing wireless telephone numbers when switching from one service provider to another. Wireless Mark-up Language Abbreviated WML -- A variation of HTML used to write Web sites that are compatible with WAP. See also WAP and HTML. Wireless Session Protocol Abbreviated WSP -- Provides the upper-level application layer of WAP with a consistent interface for two session services, a connection-mode service that operates above a transaction layer protocol, and a connectionless service that operates above a secure or non-secure datagram transport service. Wireless Transaction Protocol Abbreviated WTP -- replaces TCP in wireless networks under the WAP standard Wireless Transport Layer Security Abbreviated WTLS -- The "equivalent" to SSL (secure sockets layer) widely used in the HTML world, although not identical in functionality. Wireline Another term for landline. WISP Wireless Internet Service Provider -- Like a traditional Internet service provider (ISP), a WISP provides access to the Internet to its customers for a fee. A WISP provides a wireless connection and provides faster speeds than a dial-up connection. WLAN Wireless Local Area Network -- A flexible data communication system implemented as an extension to or as an alternative for a wired LAN within a building or campus. Using electromagnetic waves, WLANs transmit and receive data over the air, minimizing the need for wired connections. WLNP Wireless Local Number Portability -- The ability of wireless telephone customers to retain their existing wireless telephone numbers when switching from one service provider to another. WML Wireless Mark-up Language -- A variation of HTML used to write Web sites that are compatible with WAP. See also WAP and HTML. WML Card A WML card must exist inside a WML deck containing one or more cards. WML Deck A collection of WML cards. WMLscript Scripting language for WAP devices. Based on JavaScript, but less powerful. WorldClasssm An optional service that allows you to make international calls, both from the United States to other countries and while traveling in other countries. There's no monthly fee, but per-minute rates apply. All phones work in Mexico. Dual or tri-band phone needed to make calls from other countries. WSP wireless session protocol -- Provides the upper-level application layer of WAP with a consistent interface for two session services, a connection-mode service that operates above a transaction layer protocol, and a connectionless service that operates above a secure or non-secure datagram transport service. WTLS Wireless Transport Layer Security -- The "equivalent" to SSL (secure sockets layer) widely used in the HTML world, although not identical in functionality. WTP Wireless Transaction Protocol -- -- replaces TCP in wireless networks under the WAP standard WYSIWYG What You See Is What You Get

Index - X Back to top
	XML Extensible Markup Language -- W3C's standard for Internet markup languages. WML is one of these languages.

Index - Y Back to top
	No terms available at this time

Index - Z Back to top
	No terms available at this time