How To Switch To Silent Mode - Nokia Lumia 925
Learn how to switch to silent mode on your Nokia Lumia 925. When you switch silent mode on, all ringtones and alert tones are muted. Use this when you are, for example, at the theater or in a meeting.
Press a volume key to see the volume status bar at the top of the screen, and tap Sound icon.
Silent mode icon is switched on. If you have set your phone to vibrate, vibrate mode icon is switched on instead of silent mode.
If you want to set your phone to vibrate, on the start screen, swipe left, tap Settings > ringtones +sounds, and switch Vibrate to On.