The following USSD codes represent actions that you can quickly execute on your phone. These can also be used as security codes as you can use them to quickly switch off your phone or wipe any sensitive information before it gets into the wrong hands.
*#*#7594#*#*: A USSD code to manage your smartphone’s power button behavior. Normally, to turn off your phone, you need to hold the power button down, then select from the menu to shut your phone down. You can use this code to change this sequence. For example, you can set your phone to power off quickly without using the menu at all.
*#*#7780#*#*: Use this code to factory reset your phone. Factory formatting deletes all personal data, all application data (like removing your Google account settings stored on your phone), and apps from your device but doesn’t reset the firmware. This is a good option for when you want to sell your phone without any extra hassle.
*2767*3855#: The code to hard reset your Android device. Only use this code after you backed-up all of your data or in case of an absolute emergency, as it will wipe your phone clean, and delete all of your data. This code will also delete and reinstall the firmware.
*#*#273282*255*663282*#*#*: You can try using this code to quickly backup your media files before performing a factory or hard reset.
*#*#197328640#*#*: Using this code, you can switch on the Engineering/Service Mode (or Service Menu) that allows you to run different tests and change the settings of your Android device.