I get at least 30 calls a day to my business number, a mix of people trying to fax spam me on my voice number, dead line calls which hang up after a few seconds, and true robocalls. Any number I see more than once gets blocked in perpetuity, but with VoIP and caller id spoofing, it's like trying to bail the water out of the Titanic with a teaspoon. Phone spammers are high on my list of potential subjects for gruesome medical experiments.