I'm more amazed that you get 3-5 "spam" calls/day on your cell phone. I don't even get 1 "spam" call/month on my line.
I would be more careful how you give out your cell #.
And as was listed above, how does Verizon know if an auto-dialer is used, let alone if the call from an auto-dialer is "spam". Technically ALL calls initiated with speed-dial would be considered an auto-dialed phone call, yet whenever I use speed-dial I am not making a "spam" call.