I just listed my iPhone on ebay and restored it and it is currently at the plug into itunes screen. I took out my sim and it says it needs a valid sim to activate. Should I be nice and go ahead and activate it with my old sim (new one in iPhone 4) or should I leave them to get an AT&T sim and activate it themselves? I would feel bad if the buyer bought it with all intention to use it as an iPod and find this out. What would you do/ did you do?