^^^ There is no way ANYONE will ever be able to decipher a "legitimate" phone number that has been hijacked or spoofed. 90% of my "bad calls" are just that. Actual ROBO (taped message) calls are one thing. Maybe they can compile a list of those from user reports, but spoofed "real" residential numbers, even randomly generated ones that start with a real number ... no way. I have already got 2 of them today and it's been a "quiet" day. Just google "spoofed calls" and you'll find dozens of "services" that will provide any phone number you like, including, if you're unlucky, your own. Absolutely no possible way to defeat that.


Here is an interesting 2yr old article about my favorite. Despite the fact this "organization" has been busted and arrests made they are still calling me and many other many times a day. I get them on 3 phone lines & 2 cell numbers. Every time with a different local area code phone number. Over 2.6 BILLION calls made (and I think I got half of them) sometimes 2-3 times a day across all my numbers.

http://business.time.com/2012/04/06/...-just-go-away/