Ask HN: Most calls I get on my phone are bots/spam. What are my options?

Over the past few years, I have gradually been receiving more and more spam calls. Some are robo ads trying to sell me something ("I'm your local Google specialist...") and other times there is nobody on the other end (which I've heard is one way spammers check to see if a number is active).

Things have reached the point where I would estimate that the substantial majority of my phone calls are now bots.

What are my options for fixing this?