How do I allow all calls to ring

In Settings > Phone

Do you have Silence Unknown Callers turned on?

Applejimgreen Said:

"How do I set my iPhone to allow all calls to ring"

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Consider the following:

Increase the volume, and set a ringtone. Go Here: Select Ringtones and Vibrations on iPhone - Apple Support

Whomelse to Contact:

If of no success, then contact your Cellular provider, as they are the one who provide you with the service of Cellular.