How To: Put Your Galaxy S3's Screen to Sleep Just by Double-Tapping the Display

The "Knock Knock" features on LG's G2 phone have proven popular and useful enough to spawn various apps and mods cloning these abilities for other devices. Porting the "Knock On" feature to our Samsung Galaxy S3 isn't as easily doable, since developers would need to create a modded kernel, like they did for the HTC One. The "Knock Off" function, on the other hand, is a lot more manageable.

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