Not on AT&T with the sim that came with your phone. It is for international usage. From what I understand, the TP2's GSM radio is locked when inside the US so you can't use it for GSM service here....
However,
this thread is for the release of an unlocked radio which looks like it would allow you to use an AT&T sim card to use AT&T's service. Or any other US provider's sim as well.