How can I reset a second-hand iPhone to factory settings ?
How to reset a second-hand iPhone to factory settings: 1. Turn off Find My iPhone by going to Settings > [Your Name] > Find My and turning off Find My iPhone. If you don't know the Apple ID or password, contact the previous owner to do it for you. 2. Erase the iPhone by going to Settings > General > Reset and tapping Erase All Content and Settings. Enter the Apple ID password and confirm. 3. Set up the iPhone as new by turning it on and following the on-screen instructions until you reach the Apps & Data screen. Tap Set Up as New iPhone and sign in with your own Apple ID or create a new one if you don't have one yet. Follow the on-screen instructions to set up your iPhone, including setting up Face ID or Touch ID, choosing a passcode, and customizing your settings.