If the previous owner isn't present, contact them as soon as possible and ask them to use a browser to remove the device from their account. Don't take ownership of any used iPhone, iPad, or iPod touch until it has been removed from the previous owner’s account. Hand the device back to the seller and ask them to enter their password. Don't take ownership of any used iPhone, iPad, or iPod touch until it's been erased.
Ask the seller to completely erase the device by going to Settings > General > Reset > Erase All Content and Settings. If the passcode lock screen or the Home screen appears, the device hasn't been erased.Follow these steps to check if the device is ready to use: Before you buy an iPhone, iPad, or iPod touch, from someone other than Apple or an authorized Apple reseller, make sure that the device is erased and no longer linked to the previous owner’s account.
