this new ios 13 feature stops strangers and spam callers from ringing your iphone

Your iPhone will only ring if you know the person calling. Everyone else will go straight to voicemail.

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Link: https://www.gsmdb.com/cnet/how-to/this-new-ios-13-feature-stops-strangers-and-spam-callers-from-ringing-your-iphone/#ftag=CAD-01-10aai3d