- Check the cellular signal strength on the phone screen, and move to an area with better reception.
- Try reconnecting by switching flight mode (airplane mode) On and back Off in Settings. This resets the active connection.
- 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 (+) (-) keys to adjust the loudness of the ringer (scale 0 to 30). Tap on the text next to the ringer icon and change the profile to ring+vibrate.
- 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.