Hi! My friend is getting my 2G (unlocked, 2.0) iPhone, while I am getting a new 3G. He's already with ATT. He wants the 2G, but does not want the data plan. Can he just stick his SIM card into my 2G iphone? Or would he have to get it activated "officially"? If he does activate it, and is forced to pick the 2G data plan, can he go into his account in the ATT website and change it back to his previous plan? Thanks!