I really do not believe the Do Not Call thing works at all. I am on it, and still get the calls. And yes, I have learned to say hello just once...if no one answers, I hang up. If i hear all that background ruckus that kat described, I also hang up. Now I have caller ID, so sometimes I recognize the number as a telemarketer who has called before, but if I don't answer my phone, it rings 5 or 6 times before it goes to voice mail. So I click the talk, and immediately the off button.
I wish I had the reject or BLOCK feature. LOL
By the way, I also google a number if I am suspicious, and have learned of rotten telemarketers that way. Today, one from Oregon, and one from N. Dakota.
By the way, never return a call to an 809 area code. It is in the Carribbean, and you will be charged an arm & leg on your phone bill. Over $24.00 a minute!!!!