Why Test Codes Matter
These codes give you direct access to hidden phone information — battery health, sensor status, and touch functionality. No apps needed — just type the code and call.
Universal Codes — All Phones
| Code | Function |
|---|
| *#06# | Display IMEI number — verify against box and imei.info |
| *#*#4636#*#* | Battery and network info (Android only) |
Samsung Codes
| Code | Function |
|---|
| *#0*# | Full hardware test — screen colors, touch, speaker, camera, sensors |
| *#*#0842#*#* | Vibration and backlight test |
| *#*#0588#*#* | Proximity sensor test |
Xiaomi / Redmi / Poco Codes
| Code | Function |
|---|
| *#*#64663#*#* | Full hardware test — screen, speaker, camera, sensors, Bluetooth, WiFi |
iPhone — No Codes, But Alternatives
- Battery: Settings > Battery > Battery Health
- Touch screen: Open Notes app and draw across entire screen
- Face/Touch ID: Try fresh enrollment — failure may indicate replaced sensor
- Water damage: Check red indicator strip in SIM slot (iPhone XS+)
