If you bought your S9 second-hand, use *#12580*369# to check the hardware version and original date of use.
This is the most popular code for checking hardware health. You can test the LCD display , touch sensitivity , vibration , cameras , and sensors to ensure everything is working correctly. How to Use Secret Codes on SAMSUNG Galaxy S9
These codes—entered into the native phone dialer app—unlock hidden menus that allow you to run hardware tests, access usage statistics, and perform system resets without digging through the settings menu. If you bought your S9 second-hand, use *#12580*369#
This is arguably the most famous and useful code for any Samsung user. When you dial *#0*# , you are greeted with a grid of tiles. This is the LCD and Hardware Test menu. This is the LCD and Hardware Test menu
Whether you are a second-hand buyer looking to verify a device’s history, a technician troubleshooting a faulty sensor, or simply a curious user wanting to squeeze more utility out of your device, this comprehensive guide will teach you safely and effectively.
This code is essential for verifying the authenticity of the software. It displays the .
. These codes—often called MMI (Man-Machine Interface) or USSD codes—bypass standard menus to reveal hidden diagnostic tools, hardware information, and service configurations. Core Instructions for Use Open the Dialer : Tap the green icon on your home screen or in the apps drawer. Input the Code : Use the numeric keypad to type the exact sequence (e.g., Automatic Launch : In most cases, you do