I need to start getting wireless service but I want to use my current unlocked GSM phone until the next iPhone comes out a few months from now. Does anyone know if AT&T would let me do a few months without contract and then sign up for (getting the discount on an iPhone) one later on? I know they let you continue on without a contract after your contract expires. But is there a way to get service before signing a contract? The prepaid plans don't seem to have data, but I would like to get 3G data same as an iPhone (only right now I have an unlocked Nokia smartphone).