I am getting a lot of calls from a Mr. Likely. His first name is Scam. I don't know a Scam Likely, why does he keep calling me?!
Seriously though, my spam to legitimate phone call ratio is about 10 to 1 (10 calls spam/telemarketing for each call I actually want).
My phone does a good job identifying scam, and if not I simply ignore any call from a number I do not know. If it is important they'll leave a number!
The part that I do not understand is how it is possible to call 1000's of numbers for free. Just do not allow any flat plans with free calls anywhere; charge a few cents per call and lower the flat fee. Normal folks will save money, and scammer will need to pay.
Edit: Spelling