I have an App named True Caller… it catches a lot of spam callers and when the call it will say Potential Spam. I don’t answer and if they do not leave a message I know it was spam and I block that number. I would never want to block all numbers not in my contact list that would be dumb. Nor would I want to block an entire area code… dum also. Spam callers are a real PIA.
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