If you have a cell phone, down load an app called callblocker and add any number to your hang up list in the setup. I have 43 numbers setup already to hang up the call as soon as it comes in.
I have a Digitone call blocker but it doesn't do much good because the telemarketers keep changing their phone numbers. Once in a while I get a repeat number that gets blocked but most of the time I get new numbers that I add to my blocked list. I only got part of the message that said "Free trip to the Bahamas" because I deleted the message using the code "33".