I simply don't answer calls from unknown numbers. I feel like it's my right as a grown-up.
I also asked my parents and inlaws to adopt the same approach. Never pick up, never read any texts from unknown numbers. Those are all untrusted bytes.
But I feel like I have to answer when my son is at school/camp.
If someone really wants to get a hold of you, they can knock on your door.
Last week I finally had an onslaught of spam voicemails, several in an hour, that caused me to disable voicemail notifications altogether. I'll just check them when I'm expecting something now, similar to mail. My phone app was successfully filtering the calls so I wouldn't see them, but it still got routed to voicemail which then created a notification.
Voice stuff is just narcissists trying to get their way.