I had started something similar but never found product-market fit. My pitch was more about having multiple phone numbers and having a filter where it would on

I had started something similar but never found product-market fit. My pitch was more about having multiple phone numbers and having a filter where it would only allow certain phone numbers to ring your actual phone. The idea was that you would give out a phone number, like you would give the number out but it would redirect to your real number without revealing it to the caller. Once you are done with the throwaway number, you close the number and you no longer receive calls from people who had that number. The big issue with my idea is that these telemarketers and other phone ner-do-wells aren't sourcing numbers. They are blindly dialing numbers along with spoofing the incoming number so it appears local. It isn't possible to eliminate these calls by never giving out your actual phone number because your phone number is a string of 10 numbers that can be narrowed even further by knowing what area codes are in service, then narrowing even further I think on a closed set of the first three as well. Ever notice how if you pick up a scam call, they don't immediately pick up, it takes 5 - 10s? Yeah, that's because the machine keeps dialing until it gets a signal that the call was picked up so it connects you to the caller.