Noticing a huge decrease in spam calls since I started answering them and saying nothing until they hang up. I think it’s cos this actually costs them money. YMMV but in case anyone out there has the inclination to try it out.

I also subsequently block and report the number, but doing so on its own was useless. All of this is ridiculous and in a perfect world the do not call registry would work for something. But that’s not the world we live in.