Hi, I'm sorry if this has been asked already. But I searched and could not find anything that solves my issue. I am on a family plan on AT&T and am using a razr with unlimited text messaging, 900 minutes, and blocked data. I found an iPhone on eBay that's extremely cheap could I unlock/jailbreak the phone and put my sim card from the razr into the iPhone? And will AT&T know I am using the iPhone and bill me $30 for the data plan even if it is unlocked or jailboken and data is blocked? I am looking to buy the iPhone 3gs btw. Any help is appreciated.