Quickest Way to Mute/Unmute Samsung S5
After Getting the Screen On, Pull Down the Notifications Window. If Sound Isn't in There, Edit the Notifications (Pull It Down with 2 Fingers, Then Tap the...
After getting the screen on, pull down the Notifications window. If Sound isn't in there, edit the notifications (pull it down with 2 fingers, then tap the pencil) and pull it up from the bottom part of the screen (stored but not used icons) to the top part (used icons). In the future, tap it once to go to vibrate, and again to go to silent (then once more to turn sound back on).