galaxy-s4-vs-galaxy-s4-mini These secret codes allow you to test your LCD,Camera,Sensors etc These codes allow you to find out if your smartphone is working properly or not. You can test your LCD, Vibration, Camera, Sensors (accelerometer sensor, proximity sensor, magnetic sensor), touch screen, speaker, sub key etc. On your keypad *#0*# You will get a screen titled LCD TEST, and below that you will see other options that allow you to test speaker, sensor, LCD etc. Here are some other common android codes, that can work on various other android devices. * #1234# to check software version of phone. *#12580*369# to check software and hardware information. *#0228# Battery status *#0011# Service Menu