If you have Verizon, you can block 5 numbers for free for 90 days. The following numbers have called me in the last month. 9373508069, 9373150510, 6783102804, 7142412323, 9373401906, 2102156445, 9373108015, 9373811761 Supposedly there is a way to limit your calls to contact list only but never had a "customer service" (no service) agent figure how to do it. I rotate calls when new one comes in. I too am "Do Not Call" and it is another federal money pit that does not work! I went in a regenerated my number just so I can complain but it takes 30 days! Verizon has no interest in stopping or tracing numbers. Tracing is a fed responsibility but if you are willing to file suit they may assist; doubt they care. For some reason they will also block 15 text message numbers?