: Back up your old iPhone to iCloud or a computer before arriving to save time during setup. iPhone - Shopping Help - Apple
: Have your Apple Account (Apple ID) and password ready to sign in and set up your new device. buying new iphone at apple store
: Know your carrier account PIN, password, and the last four digits of the primary account holder's SSN if you plan to activate a cellular plan in-store. : Back up your old iPhone to iCloud