Nokia Lumia 920 - My Lumia phone does not alert me when receiving a call or message

  1. Check the ringer volume and profile. Press the volume key to see the volume status bar at the top of the screen. Use the volume up and volume down keys to adjust the loudness of the ringer (scale 0 to 30). Tap on the text next to the ringer icon to change the profile (vibrate only, ring+vibrate). 
  2. Check if the issue is with a specific ringtone: Go to Settings > ringtones+sounds > Ringtone, and tap on a play button to preview the ringtone.
  3. Switch off the ringer vibration (Settings > ringtones+sound > vibrate) temporarily, to determine if your phone is affected by any motion settings i.e. Flip-to-Silence.
  4. Make sure that call forwarding is not switched on: Tap the phone icon > ... > Settings.

If the problem persists, restart your phone by pressing and holding the power and volume down keys simultaneously until the phone vibrates. Release and the phone will restart. After this operation, you may need to re-adjust the volume and set date+time on the phone. Note that this does not remove your personal content.