Anyone done this with the iPhone 5? My preorder isnt scheduled to ship until 10/2, but many of the Apple Retail Stores around me still have a good stock of phones. I was thinking of cancelling my preorder to buy in store. I spoke to an Apple employee about this yesterday, and he said that it may not work. At this point, I don't want to risk messing something up. I'll also be doing an upgrade swap, as well. Anyone done this before? Did it work without any issues?