Easiest way for two people to switch an iPhone 4 and 4s I have an iPhone 4 and my wife has a 4s.  We want to trade phones.  Once we get Verizon to reassign the phone numbers,  what's the easiest way to migrate the apps, settings and data between phones?  BTW, the 4 syncs with iTunes on windows 7 and the 4s is paired with a OSX Lion machine.
Connect both phones to their current respective computers
Open iTunes and perform a backup on both phones
Swap the phones to the opposite computers.
Once swapped, click on the Restore button in iTunes, then click
Don't Back Up.
When iTunes finishes the restoring process, set up your 'new' phone
from a backup, making sure to click on your old phone's latest
backup (the one you just completed.)


This should restore the new phone to your old phone's last condition.