1. Find "Transfer or Reset iPhone"
Press Settings.
Press General.
Press Transfer or Reset iPhone.
2. Restore settings only
Press Reset.
If you choose to restore settings only, all phone settings are restored but contacts, audio files, video clips and appointments will not be deleted.
Press Reset All Settings.
Press Reset All Settings. Wait a moment while the factory default settings are restored. Follow the instructions on the screen to set up your phone and prepare it for use.
3. Restore settings and data
Press Erase All Content and Settings.
If you choose to restore settings and data, settings, contacts, audio files, video clips and appointments are deleted. When you've restored settings and data, you need to activate your phone.
Press Continue.
Press the required setting.
Press Turn Off.
Key in the password for your Apple ID and press Erase iPhone. Wait a moment while the factory default settings are restored. Follow the instructions on the screen to set up your phone and prepare it for use.