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I know many of you were asking me this, “can you use T-Mobile Galaxy S3 on AT&T and as a world phone?”
The answer is yes, once you unlock your T-Mobile Galaxy S3, you can simply change its APN settings to use it on any network you want. I do recommend trying Cellunlocker.net, you can unlock your phone for around $20-25 within an hour or two.
For AT&T, you will get 3G/HSPA+ for data but not 4G LTE since the T-Mobile Galaxy S3 lacks 4G LTE chips.
For using in other international countries like in Europe and Asia, you should also be able to get full 3G/HSPA+.