It hasn't been that long, though. This is a bit of a tautology, but I guess it skews towards people who actually advertise/distribute their primary phone numbe

It hasn't been that long, though. This is a bit of a tautology, but I guess it skews towards people who actually advertise/distribute their primary phone numbers (i.e., for business, or as a contact point for some club/group/community/org) or are otherwise in a field/business that basically boils down to networking. I'm not sure exactly when I stopped answering calls outside of my contacts, but I know it's in the past ~9 years (and I feel like I've only been very consistent about not answering for 2-3 years). I'm fairly phone-avoidant, and almost never receive a "real" call from a non-contact. But it wouldn't shock me if my last real-estate agent answered her personal cell if I called from a number she didn't recognize.