- Go to Settings>General>Reset from the Home screen.
- Reset All Settings is the last option.
- Enter the passcode if one is offered.
- To confirm, tap Reset All Settings.
The reset may take a few seconds to complete, so simply wait for it to finish.
You're effectively pushing the phone to discard changes that occurred after it was unboxed if you reset all the settings. This technique will not remove any of your personal data, such as images or movies, therefore it is completely safe to use. We still recommend that you back everything up though before doing it.
After the phone has been reset to its normal settings, keep an eye on it to see whether it is overheating or draining the battery.
