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Checking pixels, vibration, sensors, and speakers.

Some menus provide "Battery Cycle" counts which show true wear and tear.

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: Checking pixels, vibration, sensors, and speakers

Use the network menu to see if your SIM is actually connecting to the right bands.

Changing the wrong boot setting can prevent the phone from starting. Practical Use Cases For a regular user, these

Detailed signal strength and frequency band info. Version Info: Exact firmware and hardware revisions. Advanced Tweaks: Audio gain levels or USB settings. Common Codes for Smartphones

: 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 Version Info: Exact firmware and hardware revisions

Use *#0*# to ensure the screen has no dead pixels and all sensors work.