I got an iPhone 4 yesterday (many hours in line) and have it posted on eBay for sale. Wanted to know: 1. How do I un-activate the iPhone after the folks at the Apple Store set it up on my ATT account? 2. How to I re-Activate my old ATT phone? I'm new to this process; I have never had an iPhone, nor sold something like this on eBay, so these may be basic questions. Any advice you could give would be much appreciated? Also, is there anything else I should know?