So, I preordered a 4S before launch, got it in the mail, and decided to put it on eBay since I wanted to wait and get an unlocked one. Where I messed up: NOT ACTIVATING IT BEFORE SELLING IT ... The guy who bought it almost had to send it back to me because it's impossible to activate the phone through iTunes without being the original purchaser. Even if you swap the SIM card. Even if you call AT&T. Even if you call Apple. Stupid, right? So, anyone whose iPhone was "stolen" or sold before activation ... it's a paperweight unless it can be jailbroken. I wasn't even at home when this happened. I was able to "Screen Share" onto his computer, block out the window and type in my information to activate it for him. Then, poof my phone stopped working and his phone started getting my calls/texts! I should have known better ... but nightmare strikes. I called AT&T, asked them to switch the SIM Card back. They couldn't. Because that card had already been permanently deactivated. A conference call later I was able to get someone to read the SIM Card number from the AT&T unlocked phone I'd bought days earlier and switch it to that, and had to physically switch it in later. A few hours without my phone were very stressful knowing someone across the country had access to it for a few minutes. Jeez!!