On my cell phone about one a day. On the house phone about three, but this increases rapidly during political campaigns.
How do handle the ( I know you asked first ) I simply don't answer a number I don't recognise. They will leave a message if it turns out to be someone I know.
One to three a day. I'm obviously on the list . I ignore them. Sometimes I answer and try to prank them in some way. I've answered In fake languages and made odd statements lol. Funny when they hang up on you.