Earlier quoted context omitted.
Wouldn't help here in the US. They almost always fake caller id from a local prefix.
70% of the spam calls I get could be stopped simply by blocking the exact same exchange that my number is in. Do spam callers really think I'm expecting a call from the same area code, same exchange as my own number? Do most people have friends that have phone numbers with the same first six digits in common with their own? I feel like this trick can't possibly work on anyone who has already seen it twice, and just b…
All of the weirdness and strange patterns and methods you see in practice by these actors make perfect sense when you realize their targets are seniors.
In fact, even the ability to keep someone on the phone past the first 2 seconds of recorded intro greeting makes sense if that's the only interaction with a human you get all day/week.
The lives of inactive, retired seniors in the United States - especially in small or rural towns - is tremendously bleak.
And yes, they've spent their entire life with technology wherein everyone they talked to had the same NPA+PREFIX.