Updated: Feb 27
Update your devices:
1. Open the Settings app.
2. Tap General.
3. Tap Software Update. Then follow the on-screen instructions until your iPhone updates and restarts.
Back up and restore through iTunes or Finder
To back up via iTunes, connect your old iPhone LapTop, launch iTunes, select your iPhone by clicking the little phone icon in the toolbar, and under Backups, choose This Computer.
Enabling the Encrypt local backup option a good idea. If you encrypt your backup, you will be able to transfer over all your account passwords and Health data—just be sure to choose a password you won’t forget. Click the button to Back up now.
When the backup is done, connect your new iPhone and turn it on, then and choose the Restore Backup option.