LG D410 Owner's Manual

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KnockON
You can lock or unlock the screen by just double-tap.
Double-tap the center screen quickly to unlock the screen. To lock the screen, doubletap the status bar in any 
screen (except on the camera viewfinder) or empty area on the Home screen.
NOTE: When turning the screen on, make sure you do not cover the proximity sensor. 
Doing so will turn the screen off immediately after turning it on in order to prevent 
abnormal turning on in your pocket or bag.
Getting to know your phone