I apologize for the constant barrage of iPhone 4 upgrade questions, but here is mine, laid out for my needs... - My dad has himself and 4 other member of our family on a family*Family Plan. - I am the only person in the family with an iPhone -Everyone is available for an AT&T upgrade, except for me (February 2011) Here is my question: I would like to get the new iPhone 4 when it comes out. My friend wants to buy my iPhone 3Gs. She is on Verizon... From what I read, I can do family plan upgrade transfers, etc. Could I use her phone to upgrade to an iPhone 4, sell my old phone, have her new iPhone transferred over to my 3G sim card (I would keep my old number, and she would keep hers), and she would simply put a sim card back into her old phone, with her old number. Essentially, both myself and my mother would like to keep our existing numbers, but I would be using her upgrade for myself. However, I would be willing to change my number if that is the only way it works out. What is the exact process involved with this 'maneuver'?