My iPhone 13 mini won't ring while receiving incoming calls

"My iPhone 13 mini won't ring while receiving incoming calls: [...]I don't know what setting I might have changed to disable the ringer. I'm also at my MacBook with FaceTime open, but that doesn't seem to help. 'Silence Unknown Callers"'is off, and it's not a blocked contact."

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Troubleshooting iPhone Ringer:

A. Try a New Ringer: Select Ringtones and Vibrations on iPhone - Apple Support

B. Disable Do Not Disturb:

1. Open: Control Center (Swipe down from the top-right corner of the screen).
2. Tap: Focus
3. Tap: Do Not Disturb (so that it is greyed-out)

C. A Few Links that May Help:

• If you Hear No Sound or Distorted Sound from your iPhone, iPad, or iPod touch Speaker - Apple Support

• If the Microphones on your iPhone aren't Working - Apple Support

• Control Audio Playback on AirPods with iPhone - Apple Support

• Adjust Audio and Visual Settings on iPhone - Apple Support

• Adjust the Volume on iPhone - Apple Support

C. If None is of Success: Contact Apple Support.