Secret Codes - MMI USSD is a handy utility that provides you with a list of all the hidden settings on your mobile device, along with a brief description of each one. The idea is that if you know the code you can enable or disable any of the settings. The app will show you all the options that are hidden and will let you change any of them.

You can use this app on your phone, tablet, or laptop.

This app offers code that you can use to get some interesting information about your phone and battery, reset your device to factory data, remove all files and settings including the internal memory storage, and get information about phone camera.