Learn how to dial international numbers.
The easiest way to make an international call, including to and from the US, is to dial the + (which should be the same key as the 0), followed by the country code, and then the phone number. The + replaces the International Direct Dialing (IDD) code when you use a mobile phone to make a call to another country.
Call another country from the U.S
Dial "+" followed by the country code, city code (if necessary), and local number.
Call while you are outside the U.S., whether you’re calling within the country or to a location outside it
Dial "+" followed by the country code, the city code (if necessary), and the local number.
Call the U.S. from another country
Dial +1, the area code, and the number (example: +1-555-123-4567).
Call Mexico from the U.S.
- Mobile numbers: Dial + or 011 > Dial 52 > Dial 1 > Dial the ten-digit mobile number. (some mobile numbers may require the two or three digit area code after the '1')
- Landline numbers: Dial + or 011 > Dial 52 > Dial the two or three digit area code > Dial the 7 or 8 digit number.
Call toll-free numbers while you are outside the U.S.
Toll-free numbers such as 1-800 or 1-888 may not be accessible and cannot be guaranteed to work while abroad. You should look up alternate numbers in case you are unable to reach a toll-free number.
|Location||IDD||Country Code||City or Mobile Code||Phone Number||Full Number Dialed|
|Seattle, WA USA||+||1||206||XXXX-XXXX||+1-206-XXXX-XXXX|
|Mexico City, Mexico||+||52||55||XXXX-XXXX||+52-55-XXXX-XXXX|
When calling some countries, you may hear an automated message prompting you to enter a random two-digit number between 10 and 99 in order to complete the call. T-Mobile added this extra step to help prevent fraud, and it's only needed when calling certain international locations.