Develop Bugs

Does T-mobile GS3 work on ATT HSPA+?

Hi, im new, 2nd post (1st thread)
So heres some background info, I have AT&T but i work for t-mobile. Had my AT&T GS2 phone stolen by a t-mobile customer and the company I work for are great people and decided to replace my GS2 with a t-mobile gs3 for $100. They even offered me a dealer line to go with it (I get unlimited everything [NO THROTTLING] for $22 a month)
So heres my question. I know for sure that it wouldnt connect to AT&T LTE but for whatever reason if I decide to unlock and use it on my AT&T plan, does it have the proper bands required to connect to AT&T's HSPA+ network or would I be running edge?
I know all iphone's used on T-Mobile only run EDGE. (Coming later this fall they will be able to connect to t-mobile's 4g HSPA+ network)
Anybody have a clue?

I'm pretty sure it would work on atnt 3g speeds
Sent from my SGH-T999 using xda premium

It will work. The T999 has support for 1900 Mhz hspa+, which is the AT&T band.

Thanks. Much appreciated.

Confirmed working. I unlocked my T999. I have 2 sim cards, StraightTalk and Tmobile monthly 4G. I travel a lot, so depending on which carrier gives me the best signal that's what I would use. Usually, StraightTalk would give me the better signals...although Tmobile still gives me faster data speeds. just thought id share .02.

2Phonez said:
Hi, im new, 2nd post (1st thread)
So heres some background info, I have AT&T but i work for t-mobile. Had my AT&T GS2 phone stolen by a t-mobile customer and the company I work for are great people and decided to replace my GS2 with a t-mobile gs3 for $100. They even offered me a dealer line to go with it (I get unlimited everything [NO THROTTLING] for $22 a month)
So heres my question. I know for sure that it wouldnt connect to AT&T LTE but for whatever reason if I decide to unlock and use it on my AT&T plan, does it have the proper bands required to connect to AT&T's HSPA+ network or would I be running edge?
I know all iphone's used on T-Mobile only run EDGE. (Coming later this fall they will be able to connect to t-mobile's 4g HSPA+ network)
Anybody have a clue?
Click to expand...
Click to collapse
Sorry but i think is funny that you wotk for tmobile and get att instead lol, i would do it too,att has better service im on tmobile cause is cheaper tho
Sent from my SGH-T999 using Tapatalk 2

Tmobile has a faster 4g network where im at (New Jersey)

22 dollars? What crazy plan is this
Sent from my Galaxy Nexus using Tapatalk 2

babymatteo said:
Confirmed working. I unlocked my T999. I have 2 sim cards, StraightTalk and Tmobile monthly 4G. I travel a lot, so depending on which carrier gives me the best signal that's what I would use. Usually, StraightTalk would give me the better signals...although Tmobile still gives me faster data speeds. just thought id share .02.
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Click to collapse
Hi, I'm waking up this thread as I have the T999 phone and recently switched to Straight Talk SIM (AT&T).
I only get EDGE on the phone using my Straight Talk SIM.
Is there anything I need to do with the phone? It runs the latest stock, not rooted or modified as such. It is carrier unlocked.

I unlocked my t999 and using it on my contract att plan, getting hspa+ atm, just check the bands that it supports, which are 850mhz 1900mhz for att's 3.5g(not 4g) LTE is 4G.

elaxsjo said:
Hi, I'm waking up this thread as I have the T999 phone and recently switched to Straight Talk SIM (AT&T).
I only get EDGE on the phone using my Straight Talk SIM.
Is there anything I need to do with the phone? It runs the latest stock, not rooted or modified as such. It is carrier unlocked.
Click to expand...
Click to collapse
I also got straight talk att and I get hspa+.
Sent from my Calculator with Android.

jose makalolot said:
I also got straight talk att and I get hspa+.
Sent from my Calculator with Android.
Click to expand...
Click to collapse
What apn settings do you use? I plugged my ATT sim into an unlocked SGH-T999 today with the ST APN settings and only get 3G. Speed isn't bad - 1164k down/1041 up, but I would like to tap into the HSPA+ if possible.

Using T999 on AT&T?

(Did a quick forum search on this and didn't see anything that answered my question, so if this is around somewhere, I apologize.)
Okay, I'm currently with Verizon Wireless, and generally happy with my service, but what I am unhappy with is my bill (I pay $220+ a month for 4 lines, only 2 of which are Smart Phones). I'm thinking of switching to T-Mobile's prepaid service when my contract is up, and my and my wife both like the Galaxy S3, but I'm leery about T-Mobile's service in my area (I live in a rather Rural area). Ideally, I'd buy an unlocked version of the phone to use with prepaid plans (so if I'm dissatisfied with one prepaid service, I just switch out SIM cards and port my number), BUT unfortunately, the unlocked versions of the S3 that I've found don't work with the T-Mobile HSPA+ band (1700 MHz). However, what I have found is that when comparing the T999 with the I747 (T-Mobile and AT&T versions, respectively), I've found that (LTE aside) the frequencies they operate on are exactly the same, with the difference being only that T-Mobile's can use the 1700 MHz frequency.
SO, my question is: If I went ahead and sprung for a couple of T999's and found that T-Mobile didn't work for me, could I just unlock the phone for use with AT&T and pop in an AT&T SIM, and enjoy AT&T's HSPA+ goodness? Or is there something I'm missing? I know that the other way around won't work (only in very, VERY isolated spots will T-Mobile customers with unlocked iPhones and Droids that operate on 1900 MHz frequencies actually get more than EDGE speeds with their devices), but this seems like the best option (barring buying a GSM Galaxy Nexus from the Google PLAY store, which I'm not sure will be available when my contract is up - I hear that there's a new Galaxy Device being cooked up, and I'm not holding my breath for Google to sell it alongside an older Nexus device).
Opinions?
FYI, I'm not worried about LTE right now. As I said, I live in a rural area that's lucky to have 3G. LTE might not EVER make it to my area (AT&T just added 3G to my area in the last year), so HSPA+ (whether 21 Mbps or T-Mobile's 42 Mbps) is plenty fast for me (my Verizon Wireless Xperia PLAY currently pulls down 1.5 Mbps on a good day).
Link to T999: htt p://ww w.gsmarena. com/samsung_galaxy_s_iii_t999-4804.php
Link to I747: htt p://ww w.gsmarena. com/samsung_galaxy_s_iii_i747-4803.php
(Remove spaces. Would have hyperlinked, but as I don't yet have ten posts, that's illegal.)

Wow. It's refreshing to see someone do research before asking a question.
Yes, that would probably be your best bet. You can use the T-999 on AT&T HSPA+ just fine. You can even use it on Medianet's $10 unlimited data I believe since it isn't an AT&T phone. I feel like you will likely end up doing this as T-Mobile prepaid has a smaller coverage footprint than postpaid (or so they claim).
So yes, if you don't care about LTE, this would work just fine for you.

At&t user here. Yeah hspa+ works fine on it. If losing lte isn't an issue for you then go for it.
Sent from my SAMSUNG-SGH-T999 using Tapatalk 2

I was on the same boat as the OP. I bought an unlocked T999 and I am currently using on ATT's network, but through Straight Talk. I still get HSPA speeds w/o the 5GB cap.

Another AT&T user here also using Medianet plan.. Works perfect on hspa+
sent from my AOKP powered s3

Bump. Is there any specific apn settings to get h+. As i have heard straightalk at&t with tmobile s3 only gets edge speeds? Please tell me i was told wrong lol. Thanks

1slow4G said:
Bump. Is there any specific apn settings to get h+. As i have heard straightalk at&t with tmobile s3 only gets edge speeds? Please tell me i was told wrong lol. Thanks
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Click to collapse
In a similar situation!
I have the T999 with T-mobile and am moving to Kauai, am there now and the service is worthless. I looked at AT&T's prices for shi*ts and giggles and ugh, no. I just ordered a straight talk AT&T compatible sim from walmart, will need to cut it because everywhere is out of micro sims, and would like to know how successful the T999 is on the AT&T compatible network of straight talk. I seriously feel lost without data to my phone, it hurts.
I have been researching and researching the band frequencies and everything points to that it should work. I just got this phone after my rooted/unlocked SGS4g went into a toilet and then sold on ebay.
lol
BTW long time viewer of XDA, has been successful in unlocking/rooting/flashing the SGS4g and the T999, with a mac I might add which always makes things complicated.
Thanks again

adelynn2006 said:
In a similar situation!
I have the T999 with T-mobile and am moving to Kauai, am there now and the service is worthless. I looked at AT&T's prices for shi*ts and giggles and ugh, no. I just ordered a straight talk AT&T compatible sim from walmart, will need to cut it because everywhere is out of micro sims, and would like to know how successful the T999 is on the AT&T compatible network of straight talk. I seriously feel lost without data to my phone, it hurts.
I have been researching and researching the band frequencies and everything points to that it should work. I just got this phone after my rooted/unlocked SGS4g went into a toilet and then sold on ebay.
lol
BTW long time viewer of XDA, has been successful in unlocking/rooting/flashing the SGS4g and the T999, with a mac I might add which always makes things complicated.
Thanks again
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I have my t999 unlocked and with straighttalk at&t sim. I am getting 4g symbol which is hspa+ on at&t terms. Speed is great, loads up browser pages faster than my wifes tmobile and hers is on 4g aswell. Couldn't be happier. But at home and at work I have wifi so i try to avoid using too much data to avoid the infamous data cap
Sent from my Galaxy S3 using neighbors wifi

4G on straight talk

Do Straight Talk have 4G??
I have seen videos and read about people getting 4G to work after they flash they phone to straight talk, but they website dont mention anything about 4g..
I want to flash my sprint gs3 to straight talk.. but I dont think I can get 4g threw them.. but if I can just get one from them that will have 4g.. ill do that and just sell my gs3..
So, do straight talk have 4g or no??
Sent from my SPH-L710 using xda app-developers app

bigdreco said:
Do Straight Talk have 4G??
I have seen videos and read about people getting 4G to work after they flash they phone to straight talk, but they website dont mention anything about 4g..
I want to flash my sprint gs3 to straight talk.. but I dont think I can get 4g threw them.. but if I can just get one from them that will have 4g.. ill do that and just sell my gs3..
So, do straight talk have 4g or no??
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
Yes, they most certainly do... Google could have answered that for you much quicker

We might be quibbling about definitions here. If by 4G you mean LTE, then no, Straighttalk does not have 4G (of the LTE variety). 4G might also refer to HSPA+, which you'll get with Straighttalk if you have an HSPA+ compatible device.
I used a Pantech Element tablet with a Straighttalk microSIM i was swapping between an iPhone 4S and got HSPA+ service just fine. Now ofcourse the iPhone 4S does not have LTE but it would show a "4G" icon, the Pantech Element tablet was LTE compatible but i wasn't using it on any AT&T LTE plan, but it would display the 4G icon as well when on Straighttalk.
Most of it is marketing parlance really. AT&T markets HSPA+ as 4G sometimes by using qualifiers and adjectives like "enhanced backhaul" and so forth, but it's still really really fast data, even if it's not LTE.
Just be mindful of the data cap on Straighttalk though.
If you're going to flash your Sprint S3 (which is CDMA) to Straighttalk, then definitely no 4G, as you'll be using Verizon's CDMA service on Straighttalk and using EVDO (which is 3G) for data.
Have you thought about selling/trading your Sprint S3 for either a TMobile or AT&T version? You'll get much faster data on Straighttalk either with Tmobile or AT&T.

LordLugard said:
We might be quibbling about definitions here. If by 4G you mean LTE, then no, Straighttalk does not have 4G (of the LTE variety). 4G might also refer to HSPA+, which you'll get with Straighttalk if you have an HSPA+ compatible device.
I used a Pantech Element tablet with a Straighttalk microSIM i was swapping between an iPhone 4S and got HSPA+ service just fine. Now ofcourse the iPhone 4S does not have LTE but it would show a "4G" icon, the Pantech Element tablet was LTE compatible but i wasn't using it on any AT&T LTE plan, but it would display the 4G icon as well when on Straighttalk.
Most of it is marketing parlance really. AT&T markets HSPA+ as 4G sometimes by using qualifiers and adjectives like "enhanced backhaul" and so forth, but it's still really really fast data, even if it's not LTE.
Just be mindful of the data cap on Straighttalk though.
If you're going to flash your Sprint S3 (which is CDMA) to Straighttalk, then definitely no 4G, as you'll be using Verizon's CDMA service on Straighttalk and using EVDO (which is 3G) for data.
Have you thought about selling/trading your Sprint S3 for either a TMobile or AT&T version? You'll get much faster data on Straighttalk either with Tmobile or AT&T.
Click to expand...
Click to collapse
Yea I have thought of selling/trading for a T-Mobile or AT&T version.. I think that's what I'm going to do now that I know for sire that I will get faster speeds.
Sent from my SPH-L710 using xda app-developers app

bigdreco said:
Yea I have thought of selling/trading for a T-Mobile or AT&T version.. I think that's what I'm going to do now that I know for sire that I will get faster speeds.
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
That would be your best bet. In that case, you wouldn't have to flash either variant, since both of those carriers are supported on Straight Talk. The only thing you would have to do is configure the data settings to enable it. Your best bet would be to get the T-Mobile SIM, if they have good coverage and HSPA+ in your area, and use it in a T-Mo GS3. You may be able to go to a local Wal-mart and pick up a $45 card & SIM package and save a few $$ over buying it straight from Straight Talk.

LordLugard said:
We might be quibbling about definitions here. If by 4G you mean LTE, then no, Straighttalk does not have 4G (of the LTE variety). 4G might also refer to HSPA+, which you'll get with Straighttalk if you have an HSPA+ compatible device.
I used a Pantech Element tablet with a Straighttalk microSIM i was swapping between an iPhone 4S and got HSPA+ service just fine. Now ofcourse the iPhone 4S does not have LTE but it would show a "4G" icon, the Pantech Element tablet was LTE compatible but i wasn't using it on any AT&T LTE plan, but it would display the 4G icon as well when on Straighttalk.
Most of it is marketing parlance really. AT&T markets HSPA+ as 4G sometimes by using qualifiers and adjectives like "enhanced backhaul" and so forth, but it's still really really fast data, even if it's not LTE.
Just be mindful of the data cap on Straighttalk though.
If you're going to flash your Sprint S3 (which is CDMA) to Straighttalk, then definitely no 4G, as you'll be using Verizon's CDMA service on Straighttalk and using EVDO (which is 3G) for data.
Have you thought about selling/trading your Sprint S3 for either a TMobile or AT&T version? You'll get much faster data on Straighttalk either with Tmobile or AT&T.
Click to expand...
Click to collapse
I should have been more clear this is 100% correct in every way from top to bottom

Anyone using this phone on ATT

I understand that this phone has the same hardware and supports the ATT LTE bands. I am done with locked bootloaders, I need confirmation someone is using this phone on ATT Network w LTE successfully without any hacks..
Any other feedback will be great (call quality, radio performance on ATT network)
Seriously pondering getting the T-MO version. I am hoping I can get one off contract.
TIA

I am currently using the phone on at&t. LTE works. Just make sure you set your APN right. I just disabled WiFi calling because it is not supported.
Sent from my SGH-M919 using xda app-developers app

Yes I am. I had to add the apn and then choose lte in the network section. Works great though.
Sent from my HTC One using Tapatalk 2

Same here. Rooted, unlocked and running very smoothly, no lag at all.
Just need to get a case for it.
Sent from my SGH-M919 using Tapatalk 2

what is the apn setting bc im looking to switch to t mobile with the s3 att

I am NOT able to get this to work at all on mine. I am unlocked, rooted and I am using a red pocket sim that uses AT&T towers.
Any suggestions?

Did you get an unlock code from tmo, a 3rd party, or some sort of debug method a la s3 and note 2?

muqali said:
Did you get an unlock code from tmo, a 3rd party, or some sort of debug method a la s3 and note 2?
Click to expand...
Click to collapse
I'm considering buying the TMO variant to use on AT&T as well and I have a few questions related to this topic:
Would service reception be restricted to just LTE or can the T-Mobile S4 still receive AT&T's E, 3G, etc as well when used on AT&T's network?
Also, and I'm sure this is dependent on the answer to my first question, would the T-Mobile S4 work with the AT&T 3G Microcell?

Whos Lte is faster tmobiles or att.
Sent from my SGH-M919 using xda app-developers app

rp56 said:
Whos Lte is faster tmobiles or att.
Sent from my SGH-M919 using xda app-developers app
Click to expand...
Click to collapse
hard to answer; it really depends on the area, but for the most part im pretty confident in saying t-mobiles LTE is faster.
see attached photo

I've been using the T-Mobile version on AT&T for a few days. I unlocked using the debug menu instructions in this forum, setup the AT&T LTE APN and set the preferred network to LTE. It works fine on LTE, hspa, etc.
Speed test results were 53Mb down, 19Mb up, 66ms ping in Raleigh, NC.
I gave away my microcell with my POS iPhone because the Samsung phones performed OK without it. So, I can't answer whether the T-Mobile version will work correctly with a microcell.
Sent from my SGH-M919 using Tapatalk 2

Help please...
Hi all,
I have a Galaxy S4 I9500, I keep my brightness at full all the time. When I finish playing games even "subway surfer" for 10 minutes, and exit to the desktop, I find that brightness is lowered alittle bit & increase gradually to the previous state which is full brightness (from 5 to 10 seconds). Could this be a result of that when playing games, the device uses the 1.6 quad core CPU and upon exit it takes alittle time (those 5 to 10 seconds) to shift to the 1.2 quad core CPU?
Really need your help.
Thanks alot.

So it seems this is the perfect phone to use on AT&T due to all that bootloader problems and crap on the AT&T version.

So folks still running fine without issues with this device on AT&T's network? I know LTE bands over lap so those are fine and the specs for the other frequencies all line up too but any problems with any data or voice stuff at this point after more time has passed? Including text and media messaging?

Screwbal said:
So folks still running fine without issues with this device on AT&T's network? I know LTE bands over lap so those are fine and the specs for the other frequencies all line up too but any problems with any data or voice stuff at this point after more time has passed? Including text and media messaging?
Click to expand...
Click to collapse
I had left an area with LTE coverage before I was able to network unlock, so I can't comment as to how LTE is working... but I've had no problems using it on Edge or 3G, texting/mms, etc. It even works flawlessly on my Microcell with no modifications other than the network unlock.

mohan_kr said:
I understand that this phone has the same hardware and supports the ATT LTE bands. I am done with locked bootloaders, I need confirmation someone is using this phone on ATT Network w LTE successfully without any hacks..
Any other feedback will be great (call quality, radio performance on ATT network)
Seriously pondering getting the T-MO version. I am hoping I can get one off contract.
TIA
Click to expand...
Click to collapse
Mohan,
Which phone are you getting? The T-mobile version or the Google S4? I read online that the Google version of S4 is the same as the T-mobile version. I'm a T-mobile customer but I want to follow you using the Embryo rom on your new phone selection and hopefully get wifi-calling feature. I'm currently using the Embryo rom on my T989. Thanks.

adding an APN ... issues
lemme ask what will undoubtedly be a noob question. i've unlocked my T-Mo S4. confirmed. i popped in my AT&T iPhone 5's SIM card and boot up. i see that i have a signal, am able to make and receive phone calls. but no data. when i look at the APN, i'm seeing Cingular APN. what gives? i thought the phone would auto-detect and attach to the correct APN and i'd be good-to-go. thoughts? do i need to manually add the APN? I have all of the info necessary. when i try to add the APN, i am able to get to the proper menu, add all of the info. however, when i try to "save" the info, it never shows up as an APN for me to select. so whatever info i've just entered was never saved.
help!

Unlocked AT&T S3 I747 for MetroPCS/TMobile

Has anyone here bought an unlocked AT&T S3 to use on the MetroPCS/Tmobile network? If so has there been any issues? shorter battery life, bad connectivity?
I am debating getting the S3 unlocked or HTC One S. I would prefer the HTC One S but it doesn't have microSD slot

I have a SGH T999 Lte at&t branded unlocked and use on TMobile with the T999L lte rom with no ill effects.
Sent from my SGH-T999L using XDA Premium 4 mobile app

afwolfpacked said:
I have a SGH T999 Lte at&t branded unlocked and use on TMobile with the T999L lte rom with no ill effects.
Sent from my SGH-T999L using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Is that the same model as my phone? So it would be advisable, after I got the S3 to flash it with a MetroPCS ROM after activation by Metro?
I thought there would be no need of a flash if I got an unlocked phone.

edo101 said:
Has anyone here bought an unlocked AT&T S3 to use on the MetroPCS/Tmobile network? If so has there been any issues? shorter battery life, bad connectivity?
I am debating getting the S3 unlocked or HTC One S. I would prefer the HTC One S but it doesn't have microSD slot
Click to expand...
Click to collapse
You will have issues with 3G HSPA+ on 1700mhz, but 2G EDGE & 4G LTE will work just fine. If you live in a large metro area with a lot of LTE coverage it will be fine. I just went through this with my wife's phone, she had to have the Red one (AT&T specific).
edo101 said:
Is that the same model as my phone? So it would be advisable, after I got the S3 to flash it with a MetroPCS ROM after activation by Metro?
I thought there would be no need of a flash if I got an unlocked phone.
Click to expand...
Click to collapse
There is no need to flash anything, just unlock it and add/edit the APN for TMo.

DJ_SpaRky said:
You will have issues with 3G HSPA+ on 1700mhz, but 2G EDGE & 4G LTE will work just fine. If you live in a large metro area with a lot of LTE coverage it will be fine. I just went through this with my wife's phone, she had to have the Red one (AT&T specific).
There is no need to flash anything, just unlock it and add/edit the APN for TMo.
Click to expand...
Click to collapse
Sweet thanks! Both areas that I frequent have 4G and LTE coverage. My only concern is when I'm driving long distances which I often do, being in college and losing 2G signal in the middle of no where. So far with my Metro phones, I haven't seen anywhere I had 3G coverage. its always 2G and 4G/LTE

edo101 said:
Sweet thanks! Both areas that I frequent have 4G and LTE coverage. My only concern is when I'm driving long distances which I often do, being in college and losing 2G signal in the middle of no where. So far with my Metro phones, I haven't seen anywhere I had 3G coverage. its always 2G and 4G/LTE
Click to expand...
Click to collapse
Good, that is exactly what we are seeing as well. Mostly LTE coverage with EDGE to fallback on. Most all Metro areas and major highways/interstates will have good coverage. Funny enough we live in the middle of nowhere, but there is a major highway nearby so we get LTE coverage.
On a side note, US carriers marketed HSPA as 3G and HSPA+ as 4g, but both are technically 3G. True 4G is LTE. I am not sure if Metro ever had HSPA service, I think that they were just CDMA then later added LTE and have been migrated to TMo's GSM/HSPA network which now uses Metro's LTE as well. Only the newer GSM Based phones would connect to HSPA.

I have my s3 i747 unlocked an on metro I cannot get no data

banks2878 said:
I have my s3 i747 unlocked an on metro I cannot get no data
Click to expand...
Click to collapse
Check your APN settings.

i cant even get to the apn's when i goto more network then mobile networks it says insert Sim card to access network services but calling an text work fine

banks2878 said:
i cant even get to the apn's when i goto more network then mobile networks it says insert Sim card to access network services but calling an text work fine
Click to expand...
Click to collapse
What firmware are you running?
Sent from my SGH-T999 using Tapatalk

4.3 rooted.. I got data now that I flashed a modem but its very slow datai don't know how to find the right 1..heres what the one I downloaded is called modem_CWM_I747UCUEMJB

Define Slow data please. Post Speed test results.

normally around 0.15mbs but sometimes it works great and I get around 15.00mbs

Given this is not an LTE device, that sounds about right. Weather, tower congestion do affect results.

Perseus71 said:
Given this is not an LTE device, that sounds about right. Weather, tower congestion do affect results.
Click to expand...
Click to collapse
The I747 is an LTE device, my wife's (running on TMo) works just fine on LTE, just not HSPA+ 1700MHz. I'll run speed test if people would like.

Unlocked att siii will not access metro/t-mobile data
Can someone verify for me what the correct apn settings are? Should there be a network operator? And since I think the apn is finally right, do you have any more suggestions? Also, do you know if this is CDMA or GSM?

can I ask why people want to buy an ATT phone to use on a Tmobile carrier? On the S4 and Note versions, people buy Tmobile phones and use them on ATT, myself included. This is because of the bootloader, and the Tmobile phones cover ATT LTE channels while not the opposite.

Wasn't planned
I didn't intentionally set out to buy an AT&T phone, I was just looking to upgrade and this was the best deal. Or at least it looked to be on the surface. Do I just need to forget it and try to sell it?

If you are in an area recently upgraded by T-Mobile, the I747 will work just fine. However, if you are in an are not upgraded with LTE, etc, it's waay more trouble than its worth. The above post about not getting HSPA+21/42 is worth considering too though.
T-Mobile and AT&T are both GSM networks btw.
Sent from my SAMSUNG-SGH-I747 using Tapatalk

I am actually on Metro P.S, but they are on the T-mobile network now in Atlanta, Ga where I live. We do run 4glte,but so far the fastest mine will connect to shows "E" on my phone, edge maybe? One of the many I've spoken with at metro said E is 3g. One of their repair techs said I needed a different SIM card because I had a CDMA phone but when I got to the store that had one he said it was a GSM phone. It's already about been more trouble than it is worth, but as much effort as I've put into it already, I'd like to resolve it.