Don't even bother blocking numbers, now they (the scumbag telemarketers) use random number generators that show up as a different number on your caller I.D's every time that they call.- I block the whole area code with my call blocker - I won't mention the brand so that you know that I am not selling caller I.D. devices and that I am for real. Get a call blocker that can block the whole area code, and yes, you still have to put up with the local "scum" telemarketers but it sure does cut down on the traffic.