Comment by brewdad
2 years ago
Those are usually robo dialers looking for active numbers to resell to spammers/scammers. You answering puts you on their good list. These are also the calls that never leave any type of voicemail. I’m not sure what list VM gets you on.
This sounds intuitive, but isn't true in my experience. It's a natural consequence of aggressive dialing with a limited pool of agents. See my sibling comment: https://news.ycombinator.com/item?id=40882163