How To Use: Secret Codes On Samsung Galaxy S9 E... !!top!!

: Altering settings in the "Service Mode" or "Engineering Mode" without professional knowledge can permanently damage network connectivity or battery health.

Some codes (like factory reset codes) execute immediately. Do not type a code unless you understand its function. How to Use Secret Codes on SAMSUNG Galaxy S9 E...

If a code does not work, do not panic. Carriers often block certain codes for security reasons, or the code may be specific to a different Android version. : Altering settings in the "Service Mode" or

This launches the screen. You will see a grid of colored buttons: How to Use Secret Codes on SAMSUNG Galaxy S9 E...