Easier and simpler just to ignore the phone calls, very effective.  I only "think big," when thinking big is the best choice.  As for DMA, we're addressing scam calls here, not my US mailbox.  I don't want to block entire area codes, because lots of people move nowadays but don't change their old phone numbers.  I do volunteer work of an emergent nature, and people need to be able to reach me.  So "thinking big" would be overkill, it would exclude people in emergent situations who need me.  And as I said previously:  if I blocked a number, they'd just spoof new ones to get under my radar again, so it's still more effective to just ignore the specific number a scammer already uses.   "Better the devil you know, than the devil you don't" as the Irish say.  Only good guys check with DMA, criminals operate outside the law and don't consult the DMA or DNC;  that's unfortunate, because I wish the good guys could be rewarded somehow for heeding DNC, but we will never be able to do that.  I firmly believe that simpler and elegant is better in life, and it doesn't get any simpler than peeking at my CID and/or eavesdropping on my call screening feature, and simply ignoring the call.  I don't want to end up playing whack-a-mole by blocking.  I actually get very few scam calls because screening and ignoring works.  This scammer will fade away, too.