I use nomorobo to cut down on robo and scam calls. Nomorobo is free on land lines as long as you have digital phone service but they charge for mobile lines. It prevents most of them but my stupid phone company (Frontier) screws it up every now and then and I have to go back in and re-enable when they do. I contacted them a few days ago and it would not work and the person on the phone could not get it to work either so I am waiting from them to fix their problem.
--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.