So, I finally upgraded and got the new iPhone 5. I'm about to sell my iPhone 4 to someone on Craigslist later today after work...however, how do I go about getting it ready to sell? By that, I mean I want to remove my cell data off of it completely. I'd normally just remove the SIM card, but Verizon's iPhone 4 doesn't have a SIM card. So, aside from factory resetting the phone, what else do I have to do?