| Code | Function | |------|----------| | *#*#3646633#*#* | – hardware tests (display, touch, sensors, battery, etc.) | | *#*#225#*#* | Calendar & storage info (helps track scheduled events and free space) | | *#*#426#*#* | Google Play Services diagnostics (check GMS connection status) | | *#*#4636#*#* | Phone info, battery stats, usage statistics, WiFi info | | *#*#0842#*#* | Device test (vibration & backlight) | | *#*#2664#*#* | Touch screen test | | *#*#232339#*#* | WiFi test menu | | *#*#0*#*#* | LCD display test (RGB, contrast, touch) | | *#*#1234#*#* | Show firmware/PDA version | | *#*#2222#*#* | Show hardware (H/W) version | | *#*#44336#*#* | Show build time & changelist number | | *#*#0673#*#* or *#*#0289#*#* | Audio/speaker test (plays melody) | | *#*#1472365#*#* | GPS test |
