What does *# 0 *# do?

Written by Editorial Team | Last Updated: August 2026

Dialing *#0*# on certain mobile devices—most notably Samsung smartphones running Android—opens a hidden, built-in hardware diagnostic and testing menu. This engineering utility mode allows technicians and users to manually test individual phone components, including the LCD screen colors, touch sensitivity, vibration motor, front and rear cameras, speakers, sensors, and receiver functionality to ensure the device hardware is operating correctly.

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