Refer to tidbits (http://support.t-mobile.com/people/tidbits) response in this post: http://support.t-mobile.com/thread/41945. Should answer your question. I purchased the Dev Edition USA and it works fine on T-Mobile's network showing Mobile Network Type HSDPA/HSPAP w/ Signal Strengths ranging from 71-88 dBm and sometimes LTE depending on what city and state I'm in. However, the only HUGE issue I'm having is for some reason I am not able to talk on the phone and use the Mobile data simultaneously, as I have been in all of my previous HTC Android phones on T-Mobile's network for the past 4 years. When a call is connected my mobile data is disconnected and the Mobile Network Type changes from HSDPA/HSPAP to GPRS. This is unacceptable and I'm going to seek help from both T-Mobile and HTC. Good luck & all the best w/ your purchase!
that problem drove me nuts for days on end. When I thought about it I felt like the radios were being treated like CDMA radios. Which is why I went into the INFO settings and saw it was set to that.
If you are unsure(seems like you are) open the phone app
dial *#*#INFO#*#* (*#*#4636#*#*)
tap phone information
scroll down and look at the Set preferred network type:
make sure it's set to GSM/WCDMA/LTE auto
Oh no tidbits, I don't have that option. Mine is showing set on GSM/WCDMA/LTE auto and my options are:
GSM auto (PRL)
CDMA auto (PRL)
GSM/WCDMA,CDMA, and EvDo (PRL)
CDMA + LTE/EvDo auto
GSM/WCDMA/LTE auto (which is what mine is set to)
I don't have the option you switched to "GSM/UMTS/LTE". May I ask which do you think would be best to choose to fix this issue? I've read that CDMA will not allow voice and data at the same time so do you think I should choose GSM only since I haven't been able to pick up LTE hardly anywhere? (I'm a flight attendant and since having the phone the past 4 days I've only seen it go to LTE once and I think I was maybe in Philadelphia, PA. And I flew through several major city/states with this phone including here at home in NYC and still no LTE. Thanks in advance for your help!!!
Yes, it's driving me bananas also!!! I called T-Mobile's support line and the tech told me to Clear the Cach by following these steps:
- With the device turned off, press and hold the Volume Down key.
- Press and release the Power key to turn the phone on. Continue holding the Volume Down key......
But that of course didn't work. I thought it was maybe b/c I picked up the SIM from my Work base area in Orlando, FL and the reception there just isn't the best but I'm thankful to see your response! Ok, I'll give you a moment to answer my earlier response LOL.
WCDMA = UMTS so you have the correct settings
I think you might have a coverage refarm issue. You might not have enough coverage that you will drop down to EDGE(GSM) and that's when you will lose you data and voice at the same time. Also if you have wifi on and you accidently connected to it then disconnect from it you will lose data.
HTC was smart, but not so smart at the same time with WIFI. If you connect to WIFI it will ALWAYS turn off mobile data. If you are on a call and walk away from WIFI Mobile data will NOT turn on completely until you end the call. There is no way to turn this "power saving" feature off.
Awe man, this isn't the response I was hoping for I can't understand why when using both my HTC Sensation and HTC One S in all the same areas I've been in with this new HTC One I've not had this issue at all. Even in Orlando where the coverage seems to be the worst b/c I rarely will see my phone show 4G, I am still able to use data and talk at the same time....even when the bars are low and there isn't any labels on the bars (ie 4G, 3G, 2G). Why do you suppose? Also, since I've been home in NYC all day today I've had all 5 bars and an 'H' indicating either HSDPA or HSPAP, which I've read is the closest to LTE, so I'd think this was enough coverage to hold the data and call simultaneously, no?
As for the WiFi connection turning off the data connection - I did notice that and it's just rude of HTC! Hmmm, hope they come out with a fix for that. I sure do appreciate you sharing all of your expertise with me!
Oh and btw, I found this post (http://support.t-mobile.com/message/202453#202453) just now and it too sheds light on the choices btwn CDMA and GSM.
Wow tidbits I just noticed something! When I backed out of the phone app you had me to go into I decided to choose Phone Info again and the Preferred Network Type was changed to WCDMA preferred. It changed all by itself b/c I'm certain it was on "GSM/WCDMA/LTE auto" when I backed out. Do you think that could be the issue...it's not holding the "GSM/WCDMA/LTE auto" setting? Someone else in the post I just shared with you said they're phone was doing the same thing...not holding the setting they selected...
Well I changed the setting back to "GSM/WCDMA/LTE auto" and killed all running tasks, cleared the cache from the regular Settings menu options then did a soft reset of the phone (pressed and held the Power button for 10 seconds until the phone automatically restarted itself). Once restarted I went into that app again (*#*#4636#*#*) and the Preferred Network Type was still set to "GSM/WCDMA/LTE auto". So I tried a phone call and searched something on the internet and it worked! Also used the FaceBook app and pulled up a few of the Blink Feed news site full stories using both the Internet and Google Chrome browsers and it continued to work!! Well, I'm going to sleep on it and see how it acts when I wake in about 6 or 7 hours. I pray it stays fixed!
Again, I can't say thank you enough for teaching me what you have. Many blessings!
@ escapism2to1 I had similiar issues with the HTC One 64GB Developer Edition, Im in Jacksonville Florida and T-Mobile dont have much of 1900MHz refarm in many areas of Jacksonville, My phone was in EDGE most of the times. I also notice when I called someone my data would disconnect. I dont know why HTC didnt include that 1700MHz frequency to the HTC Dev Edition. I ended up selling my HTC Dev Edition on ebay for $825.00 and bought my self T-Mobile branded HTC One the only thing that I miss from the Dev Edition was the 64GB internal space. But I'm happy with T-Mobile HTC One. I paid full price for it not finance. And T-Mobile is ignoring me already because they keep denying my SIM Unlock after I purchase in full price. I will soon contact T-Mobile CEO John J Legere
Hi there ahernandez4110. I'm sorry you're having that issue and hope you get a response back from Mr. Legere. I'm my issue, though, has to be slightly different... I just pulled up the Tech Specs for all 3 phones I've recently used (HTC Sensation, HTC One S and new HTC One Dev Edition) and they all read the same capabilities (See below specs). And I have been able to use Data & Talk at the same time in all the same areas I'm in the majority of the time (NYC (home), Orlando & Tampa (work)), AND all across the US (b/c I'm a Flight Attendant). So I wonder how is it that I have phones with the same Tech Specs, used in the same areas but this new HTC One doesn't allow simultaneous Data & Talk....which leads me to believe it isn't a "Refarm" area issue. AND I was able to accomplish Data & Talk at the same time with this phone twice now (Once when I landed yesterday at LGA and then in my home this morning in Manhattan when I performed the Preferred Network changes that tidbits requested and did a Soft Reset?? Well needless to say, my success was short-lived b/c again I'm not able to use Data & talk at the same time. You posed a good point though - the SIM! So I'm going to do a SIM test, placing the SIM I picked up in Orlando into my friend's Samsung GS3 (also on T-Mobile's network) and putting hers into my HTC One and see if I get the same results. Thanks so much for your input and again all the best with your issue!!
HSDPA/WCDMA: Europe/Asia/T-Mobile US: 900/AWS/2100 MHz
Quad-band GSM/GPRS/EDGE: 850/900/1800/1900 MHz
HTC One S:
- Europe/Asia: 850/900/2100 MHz
- 850/900/1800/1900 MHz
HTC One Dev Edition:
T-Mobile (US): 850/ AWS/1900/2100 MHz with HSDPA up to 42 Mbps
2G/2.5G - GSM/GPRS/EDGE:
4G - LTE:
T-Mobile (US)/ AT&T/ Canada/ Latin America: 700 MHz and AWS band
The one thing I notice if I am in a weak signal area I will lose voice/data, but if I am in a strong signal area I never do.
I am going to do a few tests tomorrow when I get into a low coverage area. I am going to try a few APN changes and see if it's related to the current APN fast.tmobile.com. I am going to try epc.tmobile.com
Sounds good, thanks. tidbits may I ask do you too have the HTC One Dev Edition? Not the smaller 32Gig T-Mobile One from the carrier, right? Here are my findings so far - With the SIM card swap I just tried (putting my SIM into my friend's GS3 and hers into my phone) I learned that it's not the SIM. Her phone still functions as normal and as all of my past HTC phones... seamless and fast Data usage while talking. We both have a very strong signal (hers showing 4G w/ all 5 bars and mine showing H w/ all 5 bars) but time I connect the call my Data is turned off...almost as if a process/background app is automatically turned on in the background and turns the Data signal off...perhaps to preserve battery life, the way you described having the WiFi on turns off the Data signal. So I once again used ES Task Manager and Killed all running apps and wiped the Cache. Called her phone again (we're sitting right next to each other in Manhattan so great signal strength area, and my SIM is still in her phone and vice versa) and Voila! I'm able to use Data and Talk at the same time! Again though, short-lived.... It worked for about 10 minutes using Email, Internet & Chrome browser both, and Gtalk all while on the phone. But time I hit Send on the test email I sent out and backed out of the Gmail app the Data coverage dropped :-( I swear I think it's something to do an app/process turning on in the background automatically that's switching the Data Signal off
I'll also try changing my APN from fast.tmobile.com to epc.tmobile.com just in case. Thanks again.