- Make sure your phone's profile is not set to silent, flight, offline, or any other profile where ringing is silenced: Select Settings > Profiles.
- Check the settings of your active profile, especially ringtone, incoming call alert, and ringing volume, or try another ringtone: Select Settings > Profiles and the profile, then select Personalise.
- Make sure that call forwarding is not switched on: Select Settings > Call > Call forwarding.
If the problem persists, remove the battery, and put it back into the phone. Switch your phone on.