Develop Bugs

[solved.. won't work] T-Mobile 3G/4G on AT&T SGH-I747

I've got an unlocked AT&T Galaxy SIII, and I only get Edge for my data connection. Do I need to flash a T-Mobile radio? APN settings look okay, as far as I can see.
Also, can I flash a T-Mobile ROM and use Wifi calling, or is that asking too much?
I searched and couldn't find anyone asking these questions in the Q&A forum....

there are already like 3 threads below this one concerning the 3g/4g topic on a att sg3 working on tmobile. No it will not work because att sg3 does not support the aws tmobile frequencies. you will only be able to get edge. NOW if it were a tmobile sg3 on att then it would work.

All the threads I could find in this form on my search went the other way: T-Mo phone on AT&T.
Does anyone actually know whether a T-Mobile modem on an AT&T phone would work or not? I looked at the main board in my phone, and it's labelled with both SGH-I747 and SGH-T999, which makes me think the internals are fully identical.

I'd like to know this too! I also have an AT&T Galaxy SIII and was seriously considering moving to T-Mobile because of the new unlimited data plan they were going to start offering on 9/5. I had also looked through this forum, and could only find questions of the situation the other way around, T-Mob GSIII phone on AT&T network.
Basically, was wondering:
- is there a hardware limitation that APN settings and/or installing a new modem will not get me good data speeds?
- would I need to burn a new modem?
- I'm assuming at minimum I'd need new APN settings, and am assuming T-Mobile would be able to help with that. Right?
Thanks, really interested in being able to do this!
---------- Post added at 03:00 PM ---------- Previous post was at 02:13 PM ----------
Hey oblib - looks like there's an unfortunate hardware limitation we won't be able to get around: http://forum.xda-developers.com/showthread.php?t=1771021

oblib__ said:
All the threads I could find in this form on my search went the other way: T-Mo phone on AT&T.
Does anyone actually know whether a T-Mobile modem on an AT&T phone would work or not? I looked at the main board in my phone, and it's labelled with both SGH-I747 and SGH-T999, which makes me think the internals are fully identical.
Click to expand...
Click to collapse
Where did you see that the boards were labelled the same?
AFAIK, the radio's are different and flashing a T-mobile modem could possibly brick your device. It would be much easier to buy a T999 and use it on T-Mobile (it'll even work on AT&T 3G if you want to switch back, no LTE though).

The SoCs are different. Flashing a T-Mobile modem will not give you T-Mobile HSPA.

Looks like I didn't take any pictures of that side of the phone while I had it open, and I'm not eager to pop it open again. It definitely listed both models on the PCB. If I'm remembering correctly, it's on the same side as the SIM and SD card slots, so it's just matter of removing the back plate to see it, no more disassembly than that.
joshnichols189 said:
The SoCs are different. Flashing a T-Mobile modem will not give you T-Mobile HSPA.
Click to expand...
Click to collapse
Do you have part numbers for the two? According to wikipedia, they are the same Snapdragon S4 MSM8960. I just find it hard to believe that they would be different, though if they have the same pinout, that would explain the markings on my PCB.

This has been rehashed countless times. They are not the same phone. If the phones were the same, people would not be in here asking if they were the same. The MSM8960 comes in more than one flavor, with different modem parts. Yes, the CPU's are the same, but the MODEMS ARE DIFFERENT. It is an S4 Qualcomm part that comes in many different configurations. Instead of just reading until you get to some information that reinforces your preconceived notion, try reading a little further into the links at the bottom of the page and elsewhere. Seriously, if you really really don't think that Qualcomm would make different versions of the same chip, or configure them differently for the hundreds of different customer requirements, then fine, don't believe me, but it defies logic. Sorry about being an ass.

oblib__ said:
Looks like I didn't take any pictures of that side of the phone while I had it open, and I'm not eager to pop it open again. It definitely listed both models on the PCB. If I'm remembering correctly, it's on the same side as the SIM and SD card slots, so it's just matter of removing the back plate to see it, no more disassembly than that.
Do you have part numbers for the two? According to wikipedia, they are the same Snapdragon S4 MSM8960. I just find it hard to believe that they would be different, though if they have the same pinout, that would explain the markings on my PCB.
Click to expand...
Click to collapse
The T-Mobile version uses an MSM8260a. This SoC is the Krait with an adreno 225 GPU and no LTE. The MSM8960 has all three.
Sent from my SGH-T999

joshnichols189 said:
The T-Mobile version uses an MSM8260a. This SoC is the Krait with an adreno 225 GPU and no LTE. The MSM8960 has all three.
Sent from my SGH-T999
Click to expand...
Click to collapse
Thanks for the useful response. For those looking for even more detail, here's a link: http://www.qualcomm.com/sites/default/files/common/snapdragon-specs-06.07.12.pdf
According to that the MSM8960 (chip in I747?) has a "World Mode" modem, while the MSM8260a has a UMTS modem.
Edit: Ah, and I see both of you have answered this question before, which I would have found if I searched on MSM8260a. The threads have been dead for over a week, so I'm not surprised I missed them, but thanks for answering the same questions again.

T-Mobile HSPA not support i747 right now.

oblib__ said:
I've got an unlocked AT&T Galaxy SIII, and I only get Edge for my data connection. Do I need to flash a T-Mobile radio? APN settings look okay, as far as I can see.
Also, can I flash a T-Mobile ROM and use Wifi calling, or is that asking too much?
I searched and couldn't find anyone asking these questions in the Q&A forum....
Click to expand...
Click to collapse
T-Mobile uses a frequency for their 3g and 4g network that only T-Mobile branded phones have. Any other GSM phone will never get 3g or 4g on T-Mobile network unless it supports the T-Mobile band, which I believe is 1700MHz. It's limited by hardware. Nothing you can do to the phone will give you the 3g/4g you have to have a T-Mobile branded device.
Sent from my SGH-T999 using Tapatalk 2

elesbb said:
T-Mobile uses a frequency for their 3g and 4g network that only T-Mobile branded phones have. Any other GSM phone will never get 3g or 4g on T-Mobile network unless it supports the T-Mobile band, which I believe is 1700MHz. It's limited by hardware. Nothing you can do to the phone will give you the 3g/4g you have to have a T-Mobile branded device.
Sent from my SGH-T999 using Tapatalk 2
Click to expand...
Click to collapse
Not completely true. Since The Galaxy SII and the Galaxy Note (AT&T) have software radios, you can flash a radio from the TMO GSII and get 4G on TMO. I was running mine and many customers of mine like that for months until i switched phones.

Making your AT&T i747 GS3 work on T-Mobile 4G (without rooting)
oblib__ said:
I've got an unlocked AT&T Galaxy SIII, and I only get Edge for my data connection. Do I need to flash a T-Mobile radio? APN settings look okay, as far as I can see.
Also, can I flash a T-Mobile ROM and use Wifi calling, or is that asking too much?
I searched and couldn't find anyone asking these questions in the Q&A forum....
Click to expand...
Click to collapse
It works fine for me, the area i'm in does not support 4G on the 1900MHz frequency so I can definitely confirm my stock non-rooted AT&T i747 galaxy SIII is working on T-Mobile USA's 4G data network. I've uploaded a video to youtube of how to get this to work, should also work for the AT&T i317 note II as well. I can't post links on here I guess so just type my youtube username and search my videos.
youtube username: 6italia0
Video title: How to get AT&T gs3 i747 to work with Tmobile 4G (no root!)

6italia0 said:
It works fine for me, the area i'm in does not support 4G on the 1900MHz frequency so I can definitely confirm my stock non-rooted AT&T i747 galaxy SIII is working on T-Mobile USA's 4G data network. I've uploaded a video to youtube of how to get this to work, should also work for the AT&T i317 note II as well. I can't post links on here I guess so just type my youtube username and search my videos.
youtube username: 6italia0
Video title: How to get AT&T gs3 i747 to work with Tmobile 4G (no root!)
Click to expand...
Click to collapse
I think you just got it to work because T-Mobile launched 1900Mhz 4G starting 2013?

doutlaw said:
I think you just got it to work because T-Mobile launched 1900Mhz 4G starting 2013?
Click to expand...
Click to collapse
ive got a friend whos got this working, im gonna try and let you know!

I just picked up a t-mobile sim on ebay for a florida trip in a few weeks. Im hoping to get the $3 a day plan for my unlocked Galaxy s3 and hoping to get 1900mhz 4g service.
Sent from my SGH-I747M using Tapatalk 2

Same with the s2 flash an tmobile radio combo on the skyrocket and get 4g but with the s3 might be different
Sent from my SGH-T999 using xda app-developers app

IT CAN WORK (see details!)
elesbb said:
T-Mobile uses a frequency for their 3g and 4g network that only T-Mobile branded phones have. Any other GSM phone will never get 3g or 4g on T-Mobile network unless it supports the T-Mobile band, which I believe is 1700MHz. It's limited by hardware. Nothing you can do to the phone will give you the 3g/4g you have to have a T-Mobile branded device.
Sent from my SGH-T999 using Tapatalk 2
Click to expand...
Click to collapse
This is NOT TRUE, please be careful when making such "absolute" statements -- I just got a ATT i747 from craigslist, and it DOES work with the $30 Walmart plan - on 4G and LTE (depending on location).
The TRUE ANSWER IS -- IT DEPENDS -- if you live in an area that was recently upgraded to LTE (in my area was 02/13), you can get LTE/4G since t-mobile added support for it on 700 MHz (band 4) AWS (unverified - source: youtube video named "Tmobile 4G on att i747 gs3 data fix". Sorry I am not allowed to post web-links yet).
Anyway, I DO get 4G/LTE, I guess I was lucky

momchi said:
This is NOT TRUE, please be careful when making such "absolute" statements -- I just got a ATT i747 from craigslist, and it DOES work with the $30 Walmart plan - on 4G and LTE (depending on location).
The TRUE ANSWER IS -- IT DEPENDS -- if you live in an area that was recently upgraded to LTE (in my area was 02/13), you can get LTE/4G since t-mobile added support for it on 700 MHz (band 4) AWS (unverified - source: youtube video named "Tmobile 4G on att i747 gs3 data fix". Sorry I am not allowed to post web-links yet).
Anyway, I DO get 4G/LTE, I guess I was lucky
Click to expand...
Click to collapse
You do realize you resurrected an old thread, and responded to a post that was made a year ago??? Long before LTE rolled out. At the time of his post, he was 100% correct.
I dont think this is the intended way to get your 10 posts btw. There are plenty of recent issues to respond to. Thx.
Sent from my SGH-T999 using xda premium

Buy a new Note 2 or unlock my current one?

I'm currently on att with a note 2 and i've switched to t-mobile and will be recieving a new phone in the mail soon. Should i return it and just flash a t-mobile rom onto my current phone? or should i just sell my att one on craigslist and keep the new t-mobile phone? Any possible loss of features or functionality by sticking with the phone i have?

Keep the tmo one.
It dosent have lte yet, so hang on to att one too I suggest but tmo has added aws band.
Sent from my SGH-T889

prepaidguy9081 said:
Keep the tmo one.
It dosent have lte yet, so hang on to att one too I suggest but tmo has added aws band.
Sent from my SGH-T889
Click to expand...
Click to collapse
I don't understand your answer to the OP.
I'm in the exact same situation as the OP. I'm with AT&T but they just took my unlimited data plan away so I'm probably going to switch to T-Mobile.
Are there any bands that the T-Mobile Note 2 has that can't be unlocked on the AT&T model? According to Wikipedia both AT&T and T-Mobile version of the Note 2 have AWS. I heard that you can enable the high speed bands on AT&T's model to work with T-Mobile. Is taht not true?

rogerbacon50 said:
I don't understand your answer to the OP.
I'm in the exact same situation as the OP. I'm with AT&T but they just took my unlimited data plan away so I'm probably going to switch to T-Mobile.
Are there any bands that the T-Mobile Note 2 has that can't be unlocked on the AT&T model? According to Wikipedia both AT&T and T-Mobile version of the Note 2 have AWS. I heard that you can enable the high speed bands on AT&T's model to work with T-Mobile. Is taht not true?
Click to expand...
Click to collapse
Tmo hasnt released the update to let tmo gnotes2 work on their lte network, because its not up and running most places... Possibly only update customers who are in Kansas City.
Not too clear if att gnotes2 with att specific firmware would work on tmo's network. Theoretically it should work, but their might be some radio issues that give u shoddy service. Unlocking phones is illegal now, so idk if u could sim unlock ur phone through att to work for tmo anyways. Might have to go through ebay or something to do so.
Sent from my SGH-T889 using XDA Premium HD app

[Q] AT&T LTE on T889

I searched all over the place and can't find a straight answer. Can you get AT&T LTE on a T-Mobile T889 N2? I saw some threads saying you can't but then posts with in the thread saying you can. What's the deal. I am on AT&T service but switching in about 2 months to T-Mobile. That is why I have the T889. Any help or direction to get AT&T LTE working in the meantime would be great.

It won't be possible because I believe the att lte band is a band 2 and the tmobile band is a band 4
Sent from my SGH-T889 using xda app-developers app

There is so much confusion about this, I heard they were using the same bands. I think people are waiting to see when TM finally sends out the update that unlocks it . Since neither have LTE in my area, I'm in no hurry, especially since I do Go phone. If Straight Talk gets LTE on TMobile then I'll worry about it.

so lte cannot be enabled on the t889??????

It can, problem is we don't have a confirmed reversible, and safe procedure. I have a draft guide I've sent a few users via PM, but no one's gotten back to me confirming that it worked on their end.
The procedure is a bit involved and requires ADB, QPST, NV_reader_writer and CWM or TWRP along with a couple of other files.
Here's a rather lengthy post explaining what I did and what happened

Okay yeah everything said here is what i gathered. Seems that it can be done but in my exact instance it may not be worth it as i plan on switching to TMO next month. I still get HSPA+ which is plenty fast enough until then.

nfaust01 said:
Okay yeah everything said here is what i gathered. Seems that it can be done but in my exact instance it may not be worth it as i plan on switching to TMO next month. I still get HSPA+ which is plenty fast enough until then.
Click to expand...
Click to collapse
I'm not interested in getting LTE working. Currently I have AT&T micro sim and a T-Mobile Note 2, how do I get HSPA+ though? Must I unlock the phone? Also since I'm using AT&T would I flash The T-Mobile Note 2's roms or the AT&T note 2's roms?

ATT on t889
nfaust01 said:
I searched all over the place and can't find a straight answer. Can you get AT&T LTE on a T-Mobile T889 N2? I saw some threads saying you can't but then posts with in the thread saying you can. What's the deal. I am on AT&T service but switching in about 2 months to T-Mobile. That is why I have the T889. Any help or direction to get AT&T LTE working in the meantime would be great.
Click to expand...
Click to collapse
ATT Lte on T-mobile note ii is possible
because T889 has LTE bands 4,17 and Att supports band 17 and band 4 but not in all areas

felohany said:
ATT Lte on T-mobile note ii is possible
because T889 has LTE bands 4,17 and Att supports band 17 and band 4 but not in all areas
Click to expand...
Click to collapse
i gave my buddy my old note 2 officially sim unlocked for his service with at&t. would you mind posting the guide you used or your apn settings? I've hit a wall getting LTE working. it's running stock 4.3 with root and xposed.

poontab said:
i gave my buddy my old note 2 officially sim unlocked for his service with at&t. would you mind posting the guide you used or your apn settings? I've hit a wall getting LTE working. it's running stock 4.3 with root and xposed.
Click to expand...
Click to collapse
try to select lte bands only by using *#2263# and selecting network manually

felohany said:
try to select lte bands only by using *#2263# and selecting network manually
Click to expand...
Click to collapse
I had tried that as well. Anyway the device is back on tmobile as of two days ago but thank-you anyway.

[Q] AT&T Note 2 on T-Mobile?

So based on the Wireless Charging issues in the T889, I've just bought an AT&T note 2 on ebay to use on T-Mobile. I plan to unlock it and enable AWS through the hack in this thread:
http://forum.xda-developers.com/showthread.php?t=2068041
My question is, once I've done this should everything work just as well as a T-Mobile Note 2? Is there anything else I need to worry about like an APN? Will all HSPA+ and LTE frequencies then work for both carriers?

Poke_N_PDA said:
So based on the Wireless Charging issues in the T889, I've just bought an AT&T note 2 on ebay to use on T-Mobile. I plan to unlock it and enable AWS through the hack in this thread:
http://forum.xda-developers.com/showthread.php?t=2068041
My question is, once I've done this should everything work just as well as a T-Mobile Note 2? Is there anything else I need to worry about like an APN? Will all HSPA+ and LTE frequencies then work for both carriers?
Click to expand...
Click to collapse
you need Tmobile APN in order to get data. Not sure yet about the HSPA+ or LTE

jay661972 said:
you need Tmobile APN in order to get data. Not sure yet about the HSPA+ or LTE
Click to expand...
Click to collapse
Since they are so big on the Bring your own device right now I would think that would just be handled in the background.
I've got a galaxy nexus right now and I get pretty decent speeds. I never did anything besides popping in the t-Mobile sim.
I was worried about a PRL, but it looks like that is a CDMA thing only. Also, I'm curious if I can get HD Voice working.

Poke_N_PDA said:
So based on the Wireless Charging issues in the T889, I've just bought an AT&T note 2 on ebay to use on T-Mobile. I plan to unlock it and enable AWS through the hack in this thread:
http://forum.xda-developers.com/showthread.php?t=2068041
My question is, once I've done this should everything work just as well as a T-Mobile Note 2? Is there anything else I need to worry about like an APN? Will all HSPA+ and LTE frequencies then work for both carriers?
Click to expand...
Click to collapse
I did exactly what you plan to do. My AT&T Note 2 works perfectly on T-Mobile. The APN is set automatically as soon as you slip in a T-Mobile simm card. I get speeds around 12 to 16 MB per second which seems to be about typicla for T-Mobile. LTE hasn't been rolled out yet so I don't know if I'll get that but I believe I will based on what I've heard.
What's this about wireless charging though? I thought only the international version could do that.

rogerbacon50 said:
I did exactly what you plan to do. My AT&T Note 2 works perfectly on T-Mobile. The APN is set automatically as soon as you slip in a T-Mobile simm card. I get speeds around 12 to 16 MB per second which seems to be about typicla for T-Mobile. LTE hasn't been rolled out yet so I don't know if I'll get that but I believe I will based on what I've heard.
What's this about wireless charging though? I thought only the international version could do that.
Click to expand...
Click to collapse
from what I've read, it's confirmed working on AT&T and Sprint Note 2s as well. T-Mobile works with a hardware hack that isn't desirable. Don't know about Verizon.

Please read forum rules before posting
Questions and help issues go in Q&A
Thread moved
Thank you for your cooperation
Friendly Neighborhood Moderator

[Q] I have a T-Mobile S4 that refuses to select LTE for other carriers

Hey Y'all,
I've seen the other threads and I know that LTE works for AT&T but for the life of me, I cannot get it to select LTE
at all. I've tried the connections-->network mode menu and whenever I select LTE+WCDMA+GSM it always reverts
back to WCDMA+GSM the moment i back out of the menu. Also when using the *#2263# and I try and select it
via that way, I get bars but no data. Can anyone help me shed some light on this?
Is there another way to prioritize LTE? Do i need to flash a new kernel or modem?
Thanks guys!

Is lt available in your area?

mgbotoe said:
Is lt available in your area?
Click to expand...
Click to collapse
Yea that's whats bugging me. I put the AT&T sim back into my GN II and it gets LTE easy. I'm still within the return period
I just dont know if I'm missing a step or if the phone is defective. But it gets T-Mobile LTE ( in what few places get it
where I'm at ). So I don't know

Did you flash the att radio?
Sent from my SGH-M919 using Tapatalk 2

elesbb said:
Did you flash the att radio?
Sent from my SGH-M919 using Tapatalk 2
Click to expand...
Click to collapse
No I did not. I just did the unlock method that was posted here. So forgive the noob question, but I would have to flash
the AT&T radio to get LTE? Or is this just a troubleshooting method you want me to try? I just thought I wouldn't have
to flash the AT&T radio since it supported the bands Out-the-box.

Infornography said:
No I did not. I just did the unlock method that was posted here. So forgive the noob question, but I would have to flash
the AT&T radio to get LTE? Or is this just a troubleshooting method you want me to try? I just thought I wouldn't have
to flash the AT&T radio since it supported the bands Out-the-box.
Click to expand...
Click to collapse
Technically, you shouldn't have to. It supports 700 MHz LTE out of the box. The T-Mobile S4 is the "best" version because it supports both AT&T and T-Mobile bands out of the box. The AT&T S4 supports AT&T and T-Mobile LTE out of the box, but not T-Mobile HSPA+ (AWS) without a mod.

Product F(RED) said:
Technically, you shouldn't have to. It supports 700 MHz LTE out of the box. The T-Mobile S4 is the "best" version because it supports both AT&T and T-Mobile bands out of the box. The AT&T S4 supports AT&T and T-Mobile LTE out of the box, but not T-Mobile HSPA+ (AWS) without a mod.
Click to expand...
Click to collapse
Yes but without the proper radio. How's it supposed to know what to connect to
Sent from my SGH-M919 using Tapatalk 2

Product F(RED) said:
Technically, you shouldn't have to. It supports 700 MHz LTE out of the box. The T-Mobile S4 is the "best" version because it supports both AT&T and T-Mobile bands out of the box. The AT&T S4 supports AT&T and T-Mobile LTE out of the box, but not T-Mobile HSPA+ (AWS) without a mod.
Click to expand...
Click to collapse
****. That's what I thought. Oh well. I'll do an exchange then at T-mobile. Hopefully it's just this phone. Thanks guys.

Infornography said:
No I did not. I just did the unlock method that was posted here. So forgive the noob question, but I would have to flash
the AT&T radio to get LTE? Or is this just a troubleshooting method you want me to try? I just thought I wouldn't have
to flash the AT&T radio since it supported the bands Out-the-box.
Click to expand...
Click to collapse
It's more along the lines of a troubleshooting method. I believe I read another thread exactly like yours and the solution was to flash att radio. Think of it like a regular am/fm radio. All the hardware is there, but without something to control what stations it can play, how's it gonna know what to play?
Sent from my SGH-M919 using Tapatalk 2

elesbb said:
Yes but without the proper radio. How's it supposed to know what to connect to
Sent from my SGH-M919 using Tapatalk 2
Click to expand...
Click to collapse
The network is decided by the SIM card (the entire purpose of GSM). With an AT&T SIM, he should still be able to pick up T-Mobile LTE (AWS LTE is what T-Mobile uses and it's supported in all AT&T devices). My AT&T Note 2 gets T-Mobile LTE, just like my T-Mobile Note 2 does.
Also you can't cross-flash modems because the partition sizes are different; ROMs may be compatible (that's the case with the Note 2) but not the modem. If you flash another device's modem, you'll lose your IMEI (until you flash back the correct one) and your device will bootloop with no signal. From experience.
IGNORE THE GUY TELLING YOU TO FLASH THE AT&T RADIO. YOU'LL BRICK YOUR PHONE.
----------------------------
I just remembered the reason. AT&T won't activate LTE on a non-AT&T phone (on their end on the computer) unless you lie to them and give them the IMEI of an AT&T device. 10000% sure. Fixed this for another guy with a T-Mobile Note 2 trying to use it on AT&T. I have one for you. You go on chat online and tell them you're not getting LTE. They ask you for an IMEI number of an AT&T LTE device (it doesn't have to be your S4's) and then they can activate LTE on their end. I happen to have an IMEI of an in-store HTC One on hand. I'll PM you.
Here's the thread where I helped the guy (last page): http://forum.xda-developers.com/showthread.php?t=1953015

Product F(RED) said:
The network is decided by the SIM card (the entire purpose of GSM). With an AT&T SIM, he should still be able to pick up T-Mobile LTE (AWS LTE is what T-Mobile uses and it's supported in all AT&T devices). My AT&T Note 2 gets T-Mobile LTE, just like my T-Mobile Note 2 does.
Also you can't cross-flash modems because the partition sizes are different; ROMs may be compatible (that's the case with the Note 2) but not the modem. If you flash another device's modem, you'll lose your IMEI (until you flash back the correct one) and your device will bootloop with no signal. From experience.
IGNORE THE GUY TELLING YOU TO FLASH THE AT&T RADIO. YOU'LL BRICK YOUR PHONE.
----------------------------
I just remembered the reason. AT&T won't activate LTE on a non-AT&T phone (on their end on the computer) unless you lie to them and give them the IMEI of an AT&T device. 10000% sure. Fixed this for another guy with a T-Mobile Note 2 trying to use it on AT&T. I have one for you. You go on chat online and tell them you're not getting LTE. They ask you for an IMEI number of an AT&T LTE device (it doesn't have to be your S4's) and then they can activate LTE on their end. I happen to have an IMEI of an in-store HTC One on hand. I'll PM you.
Here's the thread where I helped the guy (last page): http://forum.xda-developers.com/showthread.php?t=1953015
Click to expand...
Click to collapse
Thanks for all the help guys. I already have the GN-II's imei listed on my account however and with the LTE feature code on my account thanks to my buddy who is a rep at the att store. I'm gonna meet him in a few minutes to get another sim card just to give this another shot before i do an exchange at t-mobile seeing as t-mobile is more anal about doing exchanges unless they can physically verify in store what you're *****ing about.

Product F(RED) said:
The network is decided by the SIM card (the entire purpose of GSM). With an AT&T SIM, he should still be able to pick up T-Mobile LTE (AWS LTE is what T-Mobile uses and it's supported in all AT&T devices). My AT&T Note 2 gets T-Mobile LTE, just like my T-Mobile Note 2 does.
Also you can't cross-flash modems because the partition sizes are different; ROMs may be compatible (that's the case with the Note 2) but not the modem. If you flash another device's modem, you'll lose your IMEI (until you flash back the correct one) and your device will bootloop with no signal. From experience.
IGNORE THE GUY TELLING YOU TO FLASH THE AT&T RADIO. YOU'LL BRICK YOUR PHONE.
----------------------------
I just remembered the reason. AT&T won't activate LTE on a non-AT&T phone (on their end on the computer) unless you lie to them and give them the IMEI of an AT&T device. 10000% sure. Fixed this for another guy with a T-Mobile Note 2 trying to use it on AT&T. I have one for you. You go on chat online and tell them you're not getting LTE. They ask you for an IMEI number of an AT&T LTE device (it doesn't have to be your S4's) and then they can activate LTE on their end. I happen to have an IMEI of an in-store HTC One on hand. I'll PM you.
Here's the thread where I helped the guy (last page): http://forum.xda-developers.com/showthread.php?t=1953015
Click to expand...
Click to collapse
You dont need to be so rude first of all. Secondly I never told him to do anything, i simply asked if he flashed the radio and told him it was a troubleshooting method. Meaning, research it before you do it. Just like anything else.
Secondly, others have gotten LTE on their T-Mobile devices without talking to ATT. I already stated i was using the top of my head for diagnosing and never did i tell him to do anything. And since i was going off the top of my head, i remember being able to flash ATT radios to the S3 and S2 of T-Mobile. Also, he has a T-MOBILE DEVICE wanting ATT LTE on it, not the other way around as you are thinking.. Any how, we are two very smart people, we need not argue with one another and telling the op to ignore someone. Thats just flat out rude. Especially since i never said "go flash the ATT radio" i simply asked a question.
To the OP,
Have you set up your APN configurations for ATT?

elesbb said:
You dont need to be so rude first of all. Secondly I never told him to do anything, i simply asked if he flashed the radio and told him it was a troubleshooting method. Meaning, research it before you do it. Just like anything else.
Secondly, others have gotten LTE on their T-Mobile devices without talking to ATT. I already stated i was using the top of my head for diagnosing and never did i tell him to do anything. And since i was going off the top of my head, i remember being able to flash ATT radios to the S3 and S2 of T-Mobile. Also, he has a T-MOBILE DEVICE wanting ATT LTE on it, not the other way around as you are thinking.. Any how, we are two very smart people, we need not argue with one another and telling the op to ignore someone. Thats just flat out rude. Especially since i never said "go flash the ATT radio" i simply asked a question.
To the OP,
Have you set up your APN configurations for ATT?
Click to expand...
Click to collapse
I'm sorry if I came off as rude to you; I was merely trying to tell him to not cross-flash S4 modems as it can brick the device; you have to be careful what you tell people to do if they're coming to you for help. It's not like with the S2. I correctly said he has a T-Mobile device and wants AT&T LTE on it, and as I said before, I've fixed the issue with someone who was in the same situation with a T-Mobile Galaxy Note 2. Like I stated, the phone itself is capable of 700 MHz LTE, which is what AT&T uses. You don't have to flash any modems. It should just work. The fix is above in the last paragraph.
Supported frequencies: http://www.samsung.com/us/mobile/cell-phones/SGH-M919ZWATMB-specs

Sorry guys but I just switched sims and confirmed I have an lte imei and feature on my acct but no dice.

Infornography said:
Sorry guys but I just switched sims and confirmed I have an lte imei and feature on my acct but no dice.
Click to expand...
Click to collapse
Did you try changing APN configurations?

Update: I switched the phone, did the unlock process again and....it still refuses to select LTE. I dunno. At this point I'm at a loss and thinking that it might have something to do with the unlock process itself. I might just do one more exchange and pay for the unlock. Can someone who has AT&T LTE on their S 4 do me a favor and post their APN settings so I can compare just to be absolutely sure it's correct?

I have a T-Mobile s4 that I put my AT&T SIM card in out of my AT&T galaxy note 2 and lte works fine. My issue is, I have random losses of network signal then it just comes back moments later while using the T-Mobile s4 with my AT&T SIM card. I used the unlock method posted in the T-Mobile s4 thread, rooted and flashed the Jedi Rom from the T-Mobile s4 thread. Can anyone shed some light on this issue?
Sent From An Incognegro Galaxy Note 2