I am about to trade my DX2 for an iphone4 with someone I found on craigslist. The deal sounds a little too good to be true, so I am worried about the phone being lost/stolen/damaged, etc. We have agreed to meet at a Verizon wireless store, so I can have them check to make sure the phone is legitimate right? Also, the guy says the phone is 4 months old. Would the warranty be transferable? In other words, if I take the phone in to Apple for a problem, they should still take care of me right?