I will be reserving my iPhone 4 to be picked up at the Apple Store on release day. I have already arranged to sell my 3G. My question is this. Obviously I will be resetting the phone to factory settings before I sell it. Must this be done before my phone is deactivated (when I pick up my new one) or can I do it after? Would I/should I remove the SIM from the old phone first, or do I need it in the phone when I connect it to iTunes? Will having the SIM in the phone cause it to be reactivated?