This allows you to open the Xperia's built-in service menu with a single tap instead of entering a long combination of numbers. The service menu allows you to view device configuration, software configuration and to perform tests of the various features available on your device. FAQ: 1) It says the service menu app was not found on my phone: - Try rebooting your phone. - If you are on a custom ROM, it might be an issue with that.</br></br></br></br></br></br></br></br></br>