I guess I'll be the one to go against the grain here: I might have received 2-3 spam calls in the last year, here in the US. This implies that most spam callers

I guess I'll be the one to go against the grain here: I might have received 2-3 spam calls in the last year, here in the US. This implies that most spam callers aren't simply dialing random numbers, they're getting lists from somewhere, and by luck or by care my number hasn't ended up on their lists.