I have been on the "Do Not Call" list as long as I can remember. I have used every means at my disposal to prevent unwanted calls, from an answering machine that could block a few calls to my present internet telephone service using Ooma, which can block 256 calls, including complete area code and exchanges. I also religiously report unwanted calls to the FTC every day. IT DOESN'T MATTER! In spite of my best efforts, I have received 873 calls from 531 different numbers over the past couple years, and this doesn't include the ones that I have successfully blocked. A lot of these calls are from the same people: medical alert systems, free home security systems, credit card scams, and all the rest. Every time they call, it is from a different number, which makes my effort to block them a complete waste of time. Unlike the U.S. Congress, I do NOT have a special place in my heart for political calls, surveys, or calls from charitable (hahaha!) organizations. I am an equal opportunity blocker and I don't want calls from anybody that I don't know. So my advice to you is to forget about trying to save people from the harm they do to themselves when calling about a "free" offer and do something that works to prevent those calls we don't want. BAH!