This is the only reason I kept the caller-ID feature and one of my modern cordless phones. It's hidden in a cabinet. The rest of the phones throughout my house are all 1930s "Monophones" (with a new sub-unit attached) and a 1940s "Lucy" phone. I do try to retrofit everything, but this is one of those modern inventions I have to keep. In fact I installed a Call Blocker, which has worked wonders to minimize the number of telemarketing calls. As much as I dislike modern gadgets of all descriptions, I really don't think I could survive without the Call Blocker. Before I installed it I received (no exaggeration) ten to twenty calls a day. Since I work at home at least a couple of days per week, it was absolutely maddening. I don't know exactly why the Call Blocker minimized the number of telemarketing calls , since it only blocks specific phone numbers, but now I only receive a couple of these calls a day. I've been on DNC lists for as long as they've existed, but I don't think they work anyway. There's not even a question of talking to a live human being: these new telemarketing calls appear to be entirely automated. The few times I've attempted to follow the instructions for being removed from the list I've only been disconnected. It's clearly a scam. I do believe that call blocking is the only way to get off some of those horrible lists.