I have been using a mobile phone exclusively for about 10 years now.
I am getting more of those hang up calls and spam calls. I recently installed an app called Truecaller. It intercepts some of the major spammers and flashes a red screen. Other times I get calls from numbers not in the Truecaller list. For those, I just do not answer if I do no recognize the number. I do check them in Google.
My former health insurance company called occasionally. Sometimes it was from an unrecognized number. They would leave a voice mail if I did not answer.
I use “Safest Call Blocker” which works, and I can block patterns like an area code or prefix, but I wish I could stop the blocked calls from going to VM.