I too hate those calls, and since they have found a way to use them with come of our local cell phone prefixes, one is not always sure. I let them go to the answering machine also. If I receive calls on my cell, I don't answer unknown numbers. If I'm home and get one, sometimes I pick up and just begin hitting the # sign or the number nine, I have heard that the 9 messes up their computer for a while. I don't know if it works or not, but it makes me feel better. lol