I've already sold it ($450 on eBay) and it'll be in the buyer's hands tomorrow, but I'm worried. I received a refurbished 16GB iPhone 3GS as a warranty replacement for my previous iPhone that had dust under the screen. I never activated or even put my SIM in it nor did I remove the plastic wrapping around the phone. I advertised the phone as "without contract," but I'm unsure how the buyer must go about activating it. I told him to use iTunes or to take it to AT&T. Will he have to agree to a 2 year contract or can he just put in his SIM and activate? Is he gonna have any problems? thanks for any help you guys can give me.