LG wants to secure the way you open your device with the upcoming rollout of the Knock Code feature. It builds on the Knock On feature introduced in the G2 and G Flex and lets users unlock their devices by tapping a preset code in various quadrants of the device’s screen. The feature will be available starting April on the G2, G Flex, G Pro 2, G2 mini, F Series, and L Series III.
Source: IntoMobile