Ringer
Why does my phone not ring? Text and phone calls
iPhone 12, iOS 15
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Top-ranking reply
Some things to check:
The ring/silent switch on the left side of the phone. See: How to put your iPhone on vibrate, ring, or silent mode - Apple Support
Do Not Disturb: Use Do Not Disturb on your iPhone, iPad, and iPod touch - Apple Support
If none of the above, also try restarting: Restart your iPhone - Apple Support
