Accessing a debug screen on a Samsung Galaxy mobile phone is very easy, this allows debugging and testing the hardware in a modern Android mobile phone. Just type this in the keypad to enable this debug screen.
*#0*#
Access the debug screen.
This is useful to access the sensors and other features to debug any mobile phone issues. My phone will not let me screenshot this, but this does work very well. This also may be used to test the vibration and Hall Effect sensor. The cameras may also be tested, they will not save the images, but picture taking and flash will be tested.
Display the phone’s IMEI number.
*#06#
IMEI number display.
Access USB settings on an Android Samsung Galaxy phone.
*#0808#
Samsung USB settings.