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Depending on age/current version: android has a button in settings that allows auto block of anyone not in your contacts to be auto blocked, otherwise a lessor setting of name required is defaulted to. This does demand you to keep updating contacts, and hope they aren't a multi line concern.
Not apple qualified, but I understand their system is more refined.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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