Phone won’t ring when called
My iPhone 11 won’t ring when called
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Some things to check:
The ring/silent switch on the left side of the phone. See: https://support.apple.com/en-us/HT208353
Settings > Phone > Silence Unknown Callers: https://support.apple.com/en-us/HT207099
Do Not Disturb: https://support.apple.com/en-us/HT204321
If none of the above, also try restarting: https://support.apple.com/en-us/HT201559