The codes may not work on third-party calling apps.
Note: If you have a Verizon Android device, you may be unable to access the service menu using this code method. You might need to sideload a diagnostic app instead. Be cautious when sideloading apps, as they may contain malware. [1] X Research source
On some devices, like the Galaxy S3, you will see buttons labeled with the names according to what function they will test. You can now choose a tool by tapping on the button for the respective tool on the screen to help diagnose device-related problems.
