I lost my 2G iPhone while bouncing around the City on Friday night. It's either traveling around in a Cab somewhere or on the Long Island Railroad. Either way, I doubt it's coming back... I wanted to wait until June (or whenever the next gen iPhone is coming out), but I can't be without a phone. I have AT&T service and I don't really want to change that. I don't want to re-sign for another 2 years if I can avoid it. My plan was to buy either a used phone or an unlocked phone off of the Marketplace or Ebay. If I buy an unlocked iPhone on ebay, is there a way to restore back to factory settings? Can I just go to AT&T and have them pop a new sim card in it? What have others done?