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For those of you who want to run your AT&T Galaxy S3 on T-Mobile, I have good and bad news for you.
First, the bad news is that the AT&T Galaxy S3 does not support T-Mobile 1700Mhz bands for 3G/4G, meaning you will be stuck on edge speeds although voice will work fine. Also, you do have to unlock the phone first to use it on T-Mobile (I used Cellunlocker.net to unlock SIM). But for using outside of the U.S. such as Europe and Asia, you should be able to get full 3G/HSPA+ support.
Second, the good news is that you can actually install a T-Mobile Galaxy S3 ROM (such as HighOnAndroid ROM for Tmo GS3), and make use of Wifi-calling if you use a T-Mobile SIM card. This knowledge could come in handy perhaps for those of you traveling outside the U.S. You can probably bring your T-Mo sim card with you and put it in your AT&T Galaxy S3 to make/receive free U.S. calls (if you have unlimited plan) using any WiFi network.
Of course, that’s not an ideal situation but for those of you who are wondering, now you know. And don’t buy an AT&T Galaxy S3 to use on T-Mobile, you will be stuck on edge and hating life. Don’t hate life, buy the right phone for your network.
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You will need a rooted Galaxy S3 to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF GALAXY S3! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
First time to rooting and custom ROMs? Please see our Galaxy S3 Root FAQ FIRST! Note: T-Mobile Galaxy S3 ROMs are compatible with Canadian Wind, Mobilicity, and Videotron Galaxy S3s.
AT&T Galaxy S3 ROMs are compatible with Canadian Bell, Telus, and Sasktel Galaxy S3s.