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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.