Ok so here is the deal. I am trying to sell my iphone but i need to know what i must do exactly. Does Apple register the phone itself or only the sim card?? If it is the sim card then should i buy a blank at&t sim card a put it in there?? How can i clear the phone and leave it like new for the purchaser without leaving them problems?? Please. Need help. Want to sell ASAP before it starts to "get old" with the public. Thanks!