Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0_1 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A400 Safari/528.16)
Yes, if it's unlocked it should work by just inserting your sim card
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0_1 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A400 Safari/528.16)
You can sync anything you would with a normal iPhone on AT&T.
SIM card worked, seemed to have phone service, but didn't recognize the data plan that's on the T-Mobile account, and contacts were missing (maybe this intentional?). Also, neither the iPhone or iTunes displayed the phone number. Do I need to do something special for that?