I have an iPhone 4, which I regularly sync with iTunes so I always have a relatively recent backup from which to restore if I need to wipe and start fresh. From what I understand, this method is the ...

To sync your contacts from an iPhone to a Mac, sign into the same iCloud account on both devices. Then in the account settings on both devices, toggle on Contacts. The contacts from both devices will ...

Make sure Apple Watch and old iPhone are updated and synced to iCloud > back up old phone > set up new phone. When asked to use Apple Watch, select Continue > keep devices close > follow on-screen ...