End Call/Power

    *#*#7594#*#*

This one is my favorite. This code can be used to change the action of the “End Call/Power” button. Be default, if you hold the button down for a long time, it shows a screen asking you to select between silent mode, airplane mode, and power off.
Using this code, you can enable this button to power off without having to select an option, saving you some time.