When you are operating your phone using your usual position, Luck Lock will automatically hide itself, at this moment, you can use your phone normally. When you put the phone up to your ear while making calls, Luck Lock will automatically lock your screen,in order to prevent touching mistakes. Luck Lock is a software that automatically locks the touch screen while making phone call. When you are operating your phone using your usual position, Luck Lock will automatically hide itself, at this moment, you can use your phone normally. When you put the phone up to your ear while making calls, Luck Lock will automatically lock your screen,in order to prevent touching mistakes.