The software is from RIM, but just released from the carriers. You can still use the AT&T software on T-Mobile, assuming your device is unlocked and you're using a T-Mobile SIM card.
Putting software released by T-Mobile won't get rid of the AT&T splash screen, either, if that's what you may have also been thinking.
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No longer a BES Admin, but it was fun while it lasted!
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