I have iPhone 4 and my wife has 3GS. I ordered a new iPhone 4S as an upgrade to her 3GS. My plan is as follows. Please tell me if I might be doing something out of order, or more complex than needed. 1- sync/backup wife's iPhone 3GS in iTunes 2- upgrade my iPhone 4 to iOS 5, do the iTunes sync/backup 3- open new iPhone 4S, activate in iTunes, restore from iPhone 4 backup (will then have my restored data, but my wife's number on new SIM) 4- swap SIM cards between 4 and 4S 5- connect iPhone 4 to iTunes and restore wife's 3GS backup (will now have her data and her new SIM) 6- old SIM in wife's 3GS is now deactivated. connect 3GS to iTunes and factory reset. 7- at a later date, take 3GS to AT&T store and have them add it to our plan as a new line for my daughter. Thoughts? Is this the easiest/optimal way to do it?