Dialer codes open hidden info and test screens instantly. A handful are universal, some are brand-specific gold (like Samsung's hardware test), and a few are dangerous resets to know and avoid.
- 1*#06#, IMEI (works on everything; note it down for theft reports).
- 2*#*#4636#*#*, phone info, battery status, network info on many models.
- 3*#0*#, Samsung's full hardware test menu: screen colors, sensors, vibration, speaker.
- 4*#*#2664#*#*, touchscreen test on some models.
- 5Avoid factory-reset codes unless intentional, anything documented as wiping data does exactly that.
Tip: Codes vary by brand and Android version, our Secret Codes tool has the curated list with copy buttons and warnings on the destructive ones.