Changing the wrong boot setting can prevent the phone from starting.

: The General Test Mode (Standard for most Galaxy phones). *#0011# : Service Mode for network and Wi-Fi status. *#1234# : Displays current software and PDA versions. *#2222# : Shows hardware version. The Risks of "Secret" Menus

While entering the menu is usually fine, changing factory calibrations might void your warranty. Practical Use Cases For a regular user, these menus are most helpful when:

⚠️ Never change a setting unless you have documented the original value. Most service menu changes take effect immediately without a "Save" button. To help you find the right tools, let me know: Your specific device model (e.g., S24, A54). What problem you are trying to solve.

Checking pixels, vibration, sensors, and speakers.