I got a call from 917-000-0000 this afternoon. We're not going to beat these idiots at their own game. AT&T wants to charge me a fee to block calls. My free and easy solution is to put my finger over the tiny speaker on the phone and let them waste their time waiting for me to pick up. If they're not in my address book, I don't answer. If they want to talk to me, they'll leave a message.