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Same as the title I'm on 4.1.2
So far just mute my phone based on what google saying phone power button and volume.
For my phone you just have to swipe your hand over it :p but usually it is holding the power and volume button at the same time :p it also works with home and power.
You Can Also Get An App For It If You Cant Figure It Out.. May Require Root. (Depends On Your Phone Model)
Here Try This One:You must login or register to view this content.
I Use It. Its Simple To Use.