Hi folks. I am currently out of town on business (and will be for a few more weeks). I pre-ordered my iPhone 4, it arrived at home and my wife turned around and shipped it to me at my hotel. I will get it tomorrow. Here's my question: With all the problems that have been reported (reception, yellow and sensor issues) I'm concerned about activating my phone. If I activate and find that I have a problem, is it possible to re-activate my 3GS? Effectively switching BACK to my 3GS? Thanks in advance!