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I have never once got a spam call from an international number, just local numbers. So your plan doesn't work when some local proxy is happy to take the traffic.

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A lot of the time spam calls might look like they're a local number, but they're just manipulating caller ID. Often the actual call can originate anywhere on the planet and look like a local number to you.

Up until very recently, caller ID was stupid easy to spoof if the originating phone company didn't care.

Until recently I would get spam text messages from my own cell phone number. Telecommunication companies are complicit in all of this for allowing phone number spoofing. As long as they make money I guess it's OK for them.

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