Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
So, what do you need to do with the ringing-in-response-to-incoming-call ?
- if you want the phone to ring, you have to have interruptions, or priority only, enabled.
- if you turn both Off, you have no ringtone sounding.
I don't think your phone is defective.
I suggest a compromise: turn ringtone On, to something you like to hear occasionally/frequently - but, turn Vibrate to Off.