As much as I hate the idea, I'm convinced it would be a godsent for 99% of the population.
Just imagine when you buy your SIM card the phone shop asks you: Do you want to limit incoming calls to people who you either called before or who have ever had a permanent residence in your country? 99% of spam and scam calls blocked, just like that.
And just imagine how hilarious it would be if all those Nigerian prince emails had a note that says "actually, the sender of this email has never been to Nigeria"
99% of the population is also happy with carrying a spyware device everywhere and allowing Google to know everything you do in order to serve you better ads.
I am not saying this does not have upsides, but it would be a nightmare to have it imposwd on you.
Personally I'd start with the phone system guaranteeing that the person calling me owns the number that shows up on the call display. That's how people already assume it works and would cut 90% of the spammiest of spam calls while still letting folks with family in Nigeria choose to answer those calls.
Just imagine when you buy your SIM card the phone shop asks you: Do you want to limit incoming calls to people who you either called before or who have ever had a permanent residence in your country? 99% of spam and scam calls blocked, just like that.
And just imagine how hilarious it would be if all those Nigerian prince emails had a note that says "actually, the sender of this email has never been to Nigeria"