Back up your current iPhone first, forced back up.This may not be the right place to ask this, but, OK. Dumb question. This will be my 4th iPhone and I seem to screw up the setup everytime. Is it best to just sync the new phone to iTunes or do you "restore" from your last backup? My contacts, etc. will sync through MobileMe so that is not a problem; and tunes, movies, etc will sync right in. But I want to be sure all my Apps will retain the data that they contained in the 3GS. Any advice?
When you register then set up your new phone you can choose to restore from an existing backup. Do that and all your existing stuff will be restored.