If you have an iPhone with activation lock, there are a few ways to factory reset it. Activation lock can prevent you from using your iPhone for a certain period of time, usually two hours. To factory reset your iPhone, you need to remove the battery and unlock the phone. After unlocking the phone, find and open the Settings app. Scroll down and find “Activation Lock.” Toggle on “Reset.” After resetting your iPhone, you will need to enter your Apple ID and password to re-enable service.