This one is new to me. I got a call on my answer machine that said it was Publishers Clearing House, notifying me that I had not won the big one, but I had won a smaller prize of $10K or more. This would be my notification, and be sure to call back, blah, blah...
A couple days later I get the same one time notification, and not surprisingly it had the same prize code as the first one. This time I called back, and guess what info they wanted me to provide???? Of course the recording never asked for my secret code number.
Another tip was one grammatical error, that would never have been on a large companies message.