USSD codes, also colloquially known as "secret codes", are simply codes that are used to unlock hidden actions in your smartphone
You must enter the Android security code directly into the dialer in order to run it. If the code is correctly entered, a response will be given immediately
Here is a look at some of the secret codes for Android you must know
Wipe Your Device and Reinstall Firmware
An efficient Android security code that you may use to swiftly erase all data from your device is *2767*3855#. This code goes a step further by reinstalling the firmware
Run a Factory Reset
You can remove all personal data and any applications from your device by entering the code *#*#7780#*#*. Your device will then be restored to its factory settings
Activate General Test Mode
If your android phone is not working properly, enter the code *#0*# on your Android device, This will help you to find out where & what the problem is
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