I have an iPhone 5 running iOS 11. When I receive a call, the phone vibrates but does not ring.
Do Not Disturb is off
Mute switch is on - phone will play internet radio OK
When I select Sounds > Ringtone the phone plays the tone OK. Changing the ringtone does not make the tone play when a call is received.
Volume control is up
Any other suggestions on how I can resolve this?