This doesnt really have anything to do with the iPhone, just about AT&T and I figure someone here has sold their old phone to buy an iphone. I want to ebay my old SLVR L7 with itunes. Its Cingular branded so it is not "unlocked". Ive never sold a sim-card phone before and was wondering if I have to do anything special for the buyer to get it working like you do with stupid CDMA. Do I just remove my sim-card and sell it? Or do I have to call at&t and make sure they unregister the phone?