TechNastic published a list of other Samsung secret codes recently. You can use these codes on almost all devices from the S5 to the S20 line, as well as the Note 4 to Not 20, Galaxy A to Samsung secret codes consist of specific numeric combinations that enable users to access hidden settings and diagnostic menus on their Samsung Android devices. These codes are entered through the default dialer app and provide access to a range of functions, including hardware testing and diagnostic information retrieval. 'Secret Codes' - List all of Samsung secret codes (HiddenMenu) on your device. Note: You may need ROOT to launch secret codes (use 'Launch 0' method). 'Firmware Browser' - Browse for the stock firmwares available online, for your phone and for any other Samsung model. 2R4I.