So task just released a new 4.3 rom for att but unfortunately not for t-mobile, so my question is how would I go about using it on my t-mobile phone, since the devices are almost identical I figured it wouldn't be hard, the only thing I'm worried about is the bootloader, would I just have to flash the rom and put a t-mobile bootloader and kernel on it? Or is there more than that?
Try here
http://forum.xda-developers.com/showthread.php?t=2295557
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Well, just moved to washingron, and t-mobile has no coverage within 10 miles of where I am at, but at&t has full 4g here. Got the at&t sim, on the go-phone plan, modified the apn and get data now. However, I keep getting warnings that my sim card is bad by several t-mobile functions. Can I flash an att rom to it, and do I need to avoid the att modems, or are they also ok to flash on the att network?
Sent from my SGH-T999 using xda app-developers app
5ft24 said:
Well, just moved to washingron, and t-mobile has no coverage within 10 miles of where I am at, but at&t has full 4g here. Got the at&t sim, on the go-phone plan, modified the apn and get data now. However, I keep getting warnings that my sim card is bad by several t-mobile functions. Can I flash an att rom to it, and do I need to avoid the att modems, or are they also ok to flash on the att network?
Sent from my SGH-T999 using xda app-developers app
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No. You can't do that.
re: at&t - tmobile
5ft24 said:
Well, just moved to washingron, and t-mobile has no coverage within 10 miles of where I am at, but at&t has full 4g here. Got the at&t sim, on the go-phone plan, modified the apn and get data now. However, I keep getting warnings that my sim card is bad by several t-mobile functions. Can I flash an att rom to it, and do I need to avoid the att modems, or are they also ok to flash on the att network?
Sent from my SGH-T999 using xda app-developers app
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First of all, don't flash any modems.
My phone is an AT&T Unlocked i747 Galaxy S3 and I no longer have AT&T service, but instead I chose Tmobile.
I now have a tmobile sim and have been flashing Tmobile roms ever since I changed my carrier to tmobile.
Everything works fine as long as I do NOT flash any Tmobile Modems.
None of the Tmobile or AT&T custom roms contain the modem image.
All of this also holds true when coming from Tmobile sim and going with AT&T sim.
If your phone is not unlocked I would suggest that you unlock it for best results.
Misterjunky said:
First of all, don't flash any modems.
My phone is an AT&T Unlocked i747 Galaxy S3 and I no longer have AT&T service, but instead I chose Tmobile.
I now have a tmobile sim and have been flashing Tmobile roms ever since I changed my carrier to tmobile.
Everything works fine as long as I do NOT flash any Tmobile Modems.
None of the Tmobile or AT&T custom roms contain the modem image.
All of this also holds true when coming from Tmobile sim and going with AT&T sim.
If your phone is not unlocked I would suggest that you unlock it for best results.
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What about kernels? Which T-Mobile ones can we flash onto an AT&T S3? I'm doing what you are. AT&T S3 on T-Mobile.
re: kernels
popi09 said:
What about kernels? Which T-Mobile ones can we flash onto an AT&T S3? I'm doing what you are. AT&T S3 on T-Mobile.
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If you have a tmobile sim chip then flash tmobile kernel.
If you have a AT&T sim chip then flash AT&T kernel.
But if I were you I would stay with stock kernels which all the custom Jellybean 4.1.1 roms already come with.
So if you flash a Tmobile custom rom, it will come with a tmobile kernel.
If flashing a AT&T custom rom it will come with the stock AT&T kernel.
Good luck!
Misterjunky said:
If you have a tmobile sim chip then flash tmobile kernel.
If you have a AT&T sim chip then flash AT&T kernel.
But if I were you I would stay with stock kernels which all the custom Jellybean 4.1.1 roms already come with.
So if you flash a Tmobile custom rom, it will come with a tmobile kernel.
If flashing a AT&T custom rom it will come with the stock AT&T kernel.
Good luck!
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Awesome! I have a T-Mobile Sim in my ATT s3. I'm running universe s4 ROM. So I wouldn't have to flash a kernel when flashing TW ROMs from tmo?
re: kernels
popi09 said:
Awesome! I have a T-Mobile Sim in my ATT s3. I'm running universe s4 ROM. So I wouldn't have to flash a kernel when flashing TW ROMs from tmo?
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You never have to flash a kernel regardless of which rom you flash.
All roms come with kernels, all the kernels you see here in XDA which are separate
downloads are custom kernels unless they are specified as being stock.
Custom kernels might be OK for experimenting for those people who want to
over clock or under volt their phones. In my opinion it's a waste of time and
cause more problems or issues than whatever advantages they may have.
(in my personal experience custom kernels have no real advantages at all)
tmobile phone att sim cut down
ok i have a unlocked rooted t-mobile phone, a att go phone sim, cut down to size and can make calls , and even send pictures but some small setting is stoping me from geting data to work ,
i have nothing i am worried about backing up so i can install any rom that may work i just need some direction help please i keep reading thru. all the apn setting and cant find what i may be doing wrong
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can I flash a at&t stock firmware with odin to my T-Mobile m919 with out any problems...right now my s4 is sim unlocked and im on at&t network .and it seems like its working ok but signal a little on the low side and spotty lte service....would there be any advantage flashing at&t's stock firmware to use on att network ...would my service and signal be any better.....if I wanted to would I be able to flash back to T-Mobile stock firmware...will it work....anyone try this ..anything I should know before I do this ...thanks in advance
Yes, you can. but be aware that you will lose t mobile features like wifi calling which is really useful.
re: wifi calling
XxKINGxX2580 said:
Yes, you can. but be aware that you will lose t mobile features like wifi calling which is really useful.
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He will NOT loose Tmobile wifi because he never had it, if he has an AT&T unlocked phone and
odin flashes any tmobile rom there will be no wifi calling because AT&T network itself does not offer it.
The only way he will have Wifi calling would be if he switched from the AT&T network to Tmobile network.
No one will have wifi calling regardless which rom they flash unless they have a tmobile sim card.
hope this clears things up a bit.
Misterjunky said:
He will NOT loose Tmobile wifi because he never had it, if he has an AT&T unlocked phone and
odin flashes any tmobile rom there will be no wifi calling because AT&T network itself does not offer it.
The only way he will have Wifi calling would be if he switched from the AT&T network to Tmobile network.
No one will have wifi calling regardless which rom they flash unless they have a tmobile sim card.
hope this clears things up a bit.
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I have a T-Mobile phone I use on at&t network ...flashing at&t stock firmware wont lock my phone right ..and should be able to flash back to T-Mobile stock firmware if I wanted to right..wont relock sim or bootloader....thanks guys
re: locked/unlocked
[email protected] said:
I have a T-Mobile phone I use on at&t network ...flashing at&t stock firmware wont lock my phone right ..and should be able to flash back to T-Mobile stock firmware if I wanted to right..wont relock sim or bootloader....thanks guys
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Nope, it won't lock or re-lock your phone, once a phone is unlocked properly it will stay that way
regardless which rom you flash and regardless if you're on the AT&T network or Tmobile network.
Do not Odin flash the AT&T stock firmware on a Tmobile phone even if it's unlocked.
If you do you will not be able to make or receive any phone calls.
You can flash AT&T or Tmobile CWM/TWRP flashable stock or custom zip file roms because
those do not contain the radio/modem images like the Odin flash firmware do.
If you odin flash back to stock Tmobile firmware you will loose root unless you re-root after flashing.
As far as bootloaders go, a Tmobile phone requires a Tmobile bootloader, but you don't need to worry
about that if you flash the stock official tmobile firmware with Odin.
All the other tmobile and at&t cwm/twrp flashable zip file roms found in these threads don't contain
any bootloaders that's why they can be flashed on any unlocked and rooted tmobile or at&t phones.
Misterjunky said:
Nope, it won't lock or re-lock your phone, once a phone is unlocked properly it will stay that way
regardless which rom you flash and regardless if you're on the AT&T network or Tmobile network.
Do not Odin flash the AT&T stock firmware on a Tmobile phone even if it's unlocked.
If you do you will not be able to make or receive any phone calls.
You can flash AT&T or Tmobile CWM/TWRP flashable stock or custom zip file roms because
those do not contain the radio/modem images like the Odin flash firmware do.
If you odin flash back to stock Tmobile firmware you will loose root unless you re-root after flashing.
As far as bootloaders go, a Tmobile phone requires a Tmobile bootloader, but you don't need to worry
about that if you flash the stock official tmobile firmware with Odin.
All the other tmobile and at&t cwm/twrp flashable zip file roms found in these threads don't contain
any bootloaders that's why they can be flashed on any unlocked and rooted tmobile or at&t phones.
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so the hardware is different is that why you cant flash att stock firmware with odin on a T-Mobile s4
re: locked/unlocked
[email protected] said:
so the hardware is different is that why you cant flash att stock firmware with odin on a T-Mobile s4
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Exactly, the hardware is only a little different that's why we can use the cwm/twrp flashable zipfile custom
tmobile/at&t roms with either the tmobile locked or unlocked phones or the unlocked at&t phones.
The only exception is that wifi calling only works on an actual tmobile phone with a tmobile
sim card which is on the tmobile network whether it's locked or unlocked.
[email protected] said:
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right now my s4 is sim unlocked and im on at&t network
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Misterjunky said:
The only exception is that wifi calling only works on an actual tmobile phone with a tmobile
sim card which is on the tmobile network whether it's locked or unlocked.
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Click to collapse
Don't think it matters if WiFi calling isn't enabled.
I thought the hardware between the AT&T s4 and the T Mobile s4 was the same. I thought the reason they received different radio frequencies was in the firmware and not the hardware can anyone confirm ..
I wanted to try to flash AT&T stock firmware on my t-mobile s4 for better performance on AT&T network
[email protected] said:
I thought the hardware between the AT&T s4 and the T Mobile s4 was the same. I thought the reason they received different radio frequencies was in the firmware and not the hardware can anyone confirm ..
I wanted to try to flash AT&T stock firmware on my t-mobile s4 for better performance on AT&T network
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I would love the answer to this question too.
The key is the Modem aka Baseband. This is the Radio file and it is hardware and carrier dependent. If you try to flash this you will mess up the bootloader and radio and you have a brick.
I'm too on AT&T network with T-Mobile phone. I'm using the stock MDL radio and it's working fine. I don't notice a difference between the 2 devices on LTE network. if T-Mobile can't lock on to LTE network, AT&T S4 won't either.
sorry to slightly threadjack.... but does that mean if i flash a custom s4 AT&T rom (i.e. "CleanRom"), i will still be going through a Tmobile bootloader \ kernal etc..?
Is there any foolproof way to "convert" an tmobile s4 to an ATT based s4?
Can't you guys just flash a popular custom rom for sgh-i337 variant and then change the radioband (or whatever it's called) sh*t manually? If you ever flash another carrier rom, make sure ur baseband is the original carrier/phone as stated before. And flash ur carrier/phone kernel(custom or stock, doesn't matter) as well.
I believe these ppl created this topic because they want the stock carrier branded firmware on their phone, so that they can have all the carrier specific features on their phone. Third party ROM is not their choice, otherwise there are tones post out there already. I believe someone must be brave enough to flash it to their phone to test that, otherwise, there is no good answer to that.
Cal-El said:
The key is the Modem aka Baseband. This is the Radio file and it is hardware and carrier dependent. If you try to flash this you will mess up the bootloader and radio and you have a brick.
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Hi guys, anyone can tell me if this will work:
I have TMO M991 and I want to use it in Europe but have problem with network signal (not registered on network; missed calls & s... like that).
My guess is that radio is different and optimized for LTE, which we dont have here...
I m thinking of flashing I9505 stock rom and baseband...what do You think, will this improve radio reception/stable network signal?
I9505 is the version used in Europe region...
I honestly tried to find similar topics, no luck so far so pls point me in the right direction if nothing else...
Cheers!
I just started using an AT&T branded G3 unlocked on Tmobile. I have no idea if I can flash Tmobile ROMs or if I need to stick with roms only built for AT&T? Someone please clear this up for me once and for all. Thanks!
I wouldn't flash anything thats not specifically made to work with your device. Tmobile g3 has an unblocked bootloader all other g3's are locked currently. Flash something thats not made for your specific device and you may have a paperweight.
I have an AT&T Galaxy S3 (Model SGH-i747) that I have unlocked and am using on Tmobile. Since it was originally an AT&T device, am I able to use Odin and simply replace the ROM with the Tmobile version (t999 I believe)? The phone is totally stock with the exception of being unlocked with a code from AT&T. It is running Android 4.1.2 Kernel Version 3.0.31-1300972. I downloaded a ROM for the Tmobile t999 with Android 4.3 and when I tried to install it Odin gave me an error: Secure check fail sbl2. I really don't like the AT&T boot screen and AT&T bloatware, and I'd like to run the factory Tmobile setup. Is this doable or are the 2 models of Galaxy S3 different enough to prevent it?
Flashing a stock T999 ROM will also try to flash a bootloader and modem that are not compatible with your i747 and may hard brick your phone.
Thank you, I appreciate the help. Do you know what options are available if I want to get rid of the AT&T boot screen and bloatware (Specifically the AT&T contacts book) while maintaining all the functionality of the device? I have been searching around on this site and google and I've been having a hard time finding information specific to this situation.
You could try a custom ROM but before flashing anything, it's a good idea to verify your bootloader and modem version.
If you are running an old bootloader and modem, you'll have to decide if you want to upgrade to use the latest custom ROMs or stick with your current bootloader and modem.
Hey guy I just unlocked an old SGS3 for AT&T SGH-I747. Now i plan on giving the phone to my mom for her to use since her current phone is a POS... how would i go about getting tmobile firmware on it for her without bricking. I know i have to root first and then Recovery then Rom, but is it safe and stable to run TMO rom on the att model of the S3. I just want to make sure that i go about this the rite way.
Thanks in advance
Will she be using T-Mobile data? The i747 does not natively support aws frequencies so that may be a problem. Voice calls would probably work.
You can't flash the t999 modem and bootloader to the i747 so forget about flashing a T-Mobile rom to i747.
Pray tell: How did you Un-Lock it?
I haven't been able to get past the debug screen?
Any info is appreciated, Thanks!
JosephJ85 said:
Hey guy I just unlocked an old SGS3 for AT&T SGH-I747. Now i plan on giving the phone to my mom for her to use since her current phone is a POS... how would i go about getting tmobile firmware on it for her without bricking. I know i have to root first and then Recovery then Rom, but is it safe and stable to run TMO rom on the att model of the S3. I just want to make sure that i go about this the rite way.
Thanks in advance
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