I have caller ID and don't answer any #s I don't recognize. One time I answered a call from "private caller" thinking it was my daughter. It was a solicitor, so my reply was, "Do you want me to donate to you or pay for my medications, I can't do both?" He hung up on me. I found that works wonders, have since used it a couple times. I also have call blocking and can block a certain # of #s.