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Old February 17th, 2014, 06:51 AM   #1 (permalink)
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Default T-Mobile phone on AT&T

I have a Galaxy S4 T-Mobile edition. (M919) and it is unlocked. So I know I should be able to put in an AT&T sim card and it will work.

Is it possible to flash an AT&T rom (or one of those multi carrier rom's) onto that phone and have it work?

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Old February 18th, 2014, 10:19 AM   #2 (permalink)
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Is it possible? Yes - if the ROM is written to be used that way. It has to be specifically written to run on both AT&T and TMobile (if that's what you want) on am M919.

ROMs aren't like text editors, you can edit any text on any editor, they're more like DNA - if you transplant the wrong one it kills the patient. If you're lucky the phone only hard-bricks and can (with the right knowledge and equipment) be brought back to life. But in many cases the phone becomes landfill.
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Old February 18th, 2014, 10:22 AM   #3 (permalink)
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If the phones unlocked, you shouldn't even need to flash a ROM. Just pop in a Sim and go
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Old February 21st, 2014, 12:49 AM   #4 (permalink)
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Quote:
Originally Posted by BrownHP800 View Post
I have a Galaxy S4 T-Mobile edition. (M919) and it is unlocked. So I know I should be able to put in an AT&T sim card and it will work.

Is it possible to flash an AT&T rom (or one of those multi carrier rom's) onto that phone and have it work?
Yes, it is possible for most, but only custom cwm flashable packages, and, as long as you flash a kernel for the tmobile s4 after flashing the rom. The ROM does not have to be specifically written to be used on at&t and tmo.

AT&T and Tmo phones are identical except for the modem bands, bootloader and some other minor kernel parameters. The first two are never included in cwm packages, and the second can be mitigated by using a kernel for the variant.

Most custom ROMs (CMW/TWRP packages) are interchangeable among almost all the variants of the s4 including at&t, tmo, sprint, i9505, i9505g, (not i9500 and i9506) as long as the ROMs are not completely dependent on a single version of a custom kernel.

In other words, if the ROM does not specifically require a custom kernel by the creator and can run on any other made by someone else, then you can run that ROM on the variants as long as you flash a kernel specific to the model. For example, on a TMO S4, you can flash a i9505 custom ROM and consecutively flash a Tmo kernel for it to work (like ktweaker for instance).

Now, stock ROMs directly from samsung are different, because they are complete packages, they include too many partitions that can't be flashed. For example, the modem image, it can't be flashed across variants because they have different modems. Another example, the bootloader, variants have different bootloaders, some locked, some unlocked. Thus, only custom cwm ROMs can be flashed because they do not include any of the above, only system, data (sometimes) and kernel. However, you could extract the system image from the tar package and flash it directly, without flashing anything else.

Which is why, I don't recommend you flash an AT&T rom. Instead, get a custom one.
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Old February 21st, 2014, 01:41 AM   #5 (permalink)
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There is no reason to do this

Tmobile note ii
Aio wirless [at&t]
And I get lte.

What other reason is there for wanting an att rom?

You dont need it just run any rom from the tmobile section for your phone and it will run just fine.

You prolly wont get lte on att or gophone tho. Check out aio

Their lte is capped at hsdpa+ speeds anyways but unlimited after softcap of 5gb at 128kbps for the same 60 bucks for 2gb on go phone
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