Do you know that you can access a hidden test menu on your Samsung phone? This unique feature was first uncovered by Android Central months ago.
Just dial *#0*# on the keypad and presto! a hidden menu appears. With this menu, you can troubleshoot hardware issues and check your phone’s functionality
The menu contains a host of service checks such as tapping the red, green, and blue buttons along the top to check for dead pixels on the display.
However these service checks will only be meaningful if you are technically inclined. So be careful when meddling around in any menus and don’t ever change any settings unless you know what they do.
