Thankfully there's a neat way to do this in BlackBerry 10.
Using the volume keys, drop the volume level down to nil so that the mute icon appears.

Now, just press the volume down button one more time.

POW! The handset vibrates and the Silent Mode notification appears on the screen to both to let you know that it is now in Silent Mode.
This can be done from the lock screen as well, so you don't have to worry about unlocking the phone or being able to see the screen. Just thumb that volume rocker!
To return the phone to your previous sound profile, just press the volume up key.
Nice.







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