In lollipop there is no way to mute phone from lock screen. To avoid entering the pin... Or even touching your phone in your pocket install wearable widgets from Samsung store onto your gear. Now install silent mode widget from playstore on your phone. Now put silent mode widget into wearable widget app on phone. This will put a widget on your gear (i think any model) that allows you to pick silent.,vibrate, or volume on from your gear. No need to pull out your phone in class or meeting or movie to go into quiet mode!
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