(Sp Correct-I'm bad)....I have one as well-read the owners manual "blocking ranges of numbers". You can actually block a range of numbers with as few as 2 digits. So if I block say 80, 800, 801, 802, 803...and so on would be blocked. So blocking groups of area codes it easy. If you do the math, 10x10=100 you could block every possible area code in the country (real and fictitious) and still have 150 spaces available. Of course you don't want to block your own area code or friends or family, so you'll need to adjust accordingly by adding digits and skipping some area codes. I have 96% of all area codes blocked and love the quiet.
Idiot called trying to sell me a security system. I asked where he was calling from, and he said it didn't matter. When he asked if I had a system already, I said "It doesn't matter". I told him I was on the DNC and hung up. Blocked his calls