I received a call from this number tonight and when I tried to do a reverse lookup, nothing came up for the number 480-442-1940.  I am on a do not call list as well.  I refuse to answer phone calls if I don't know the number calling or if I suspect it to be a telemarketer.  Out of curiousity I picked up the phone but said nothing.  A man came on using my first name and when he wasn't getting a response he hung up.  Next time that number calls me I am going to have a whistle handy and use it as loud as I can when I answer.  Maybe a shock and sore eardrum may get the message across that I'm not interested!!