I was dead tired last night. So tired that even the most severe earthquake and tornado combined couldn't wake me. So when the telephone rang at around 9 pm I didn't hear it and the phone is right next to me on the loudest ring! I was pretty surprised to find I had a call last night @@, Anyway, it doesn't matter what kind of equipment you have to block these guys. You could have one that blocks 2 billion calls and they'd still call under changed numbers--somehow they'd find one! /:(
Some call blockers can block entire area codes, and entire exchanges within an area code, so that reduces the number of individual numbers you have to block.
There are no area codes that begin with "0" or "1" and that's two billion by themselves. Also no exchanges that begin with those two numbers.