Samsung Users..save wear on your ON & OFF button on side of mobile..very costly if it goes or new phone.
Go to Settings..then Avanced Features..then Motions & Gestures.
Press.. Double Tap Off and Double Tap On Buttons.
Be weary tho in a case or pocket..can come on accidentally.Useful if your on phone a lot eg. researching, reading and phone screen shuts down. of course you can extend screen time, but uses battey up when not in use.
