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I tried a similar scenario: The phone has a nfc reader built in, so I put the tag on the charger and tried letting the phone read it, but quickly discovered that android can’t/wont read nfc tags unless the phone is unlocked, which defeated the elegance of the solution. I hadn’t considered buying a standalone reader and attaching the tag to the phones, that sounds a lot more complicated.
I think it’s too late for this to be useful. Number spoofing is ultra-common these days and most of the unwanted calls I receive are from spoofed numbers that appear to come from local areas.
If we start blocking the spoofed numbers then eventually we’ll just be blocking every possible combination of digits that can exist.
What we really need first is better detection and blocking of calls using spoofed numbers.