: Use the built-in guide at Apple Support to safely back up your data, sign out of iCloud, and erase all settings before handing over the device.
If you are trying to impress a buyer or test a new purchase, try these unique features: If you want to buy a preowned iPhone - Apple Support iphone buy and sell
Buying or selling an iPhone involves more than just checking for scratches. Modern iOS versions include built-in tools that make the process safer and more transparent for both parties. : Use the built-in guide at Apple Support