I have a family plan on ATT. My iPhone 4 was recently stolen and I've suspended my service. I'm not eligible for upgrade pricing until June. My daughter has a 3GS on the plan and is eligible for upgrade pricing now. I'd like to use her upgrade to replace my 4. My thought was that I would upgrade her then reactivate my account and ask ATT to switch her back to the 3GS and put my account on the replacement 4. What would be the best way to go about it? Thanks for any advice!