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The problem I notice is that I'm getting calls from my local area code (low population area). Chances are those numbers are registered, used, and released. Poor dev or person in the near future will find themselves on a blacklist.



Those numbers are just the caller id rather than the true origin of the caller. Anybody can claim anything as their caller id. The phone companies know the true origin (usually outside the US) but they do not pass that information forward.




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