I sold this iPhone 4 on ebay a few days ago. It was almost new. the iOS was 4.0.2 so I jailbroke and unlocked it before selling. The buyer is emailing me now that he put his sim card into the phone, the phone said t-mobile at the top, and then searching/no service. He said he tried rebooting the phone and still the same thing. I suggested maybe that the sim card was cut bad, so he went and had it done at a different store, and the problem is still the same. Anyone have any idea what the problem might be? I would really appreciate it. Thanks.