LG first showed the Knock Code function back in 2013, with the LG G2 and LG G Flex devices. And now, in 2014, the function coming to more LG smartphones (L Series and F series) via a firmware update starting in April.
Knock Code uses a series of taps at specific points on the screen to both wake up and unlock the device, sort of like Android’s default pattern unlock (with the screen off). You can see a video demo of Knock Code here.
If you forget to implement Knock Code in the initial setup process, you can do so later through the settings menu. Go to Settings>Display>Screen Security, and then choose "Knock Code." You’ll then go through the same setup process.
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