Things like this make me think there might be value in an "elderly mode" on phones wherein the phone only accepts inbound calls from numbers that the user has m

Things like this make me think there might be value in an "elderly mode" on phones wherein the phone only accepts inbound calls from numbers that the user has made outbound calls to in the past. Businesses you haven't called yourself would have to use the postage system instead, which seems like a positive improvement. Of course, such a system would not necessarily be worth much until the number spoofing problem has been resolved. Two phones both in elderly mode could whitelist each other using NFC perhaps. (Maybe that's not a great name for it. In truth, I think I would use this elderly-mode too.)