Unknown caller. when you answer the caller hangs up. Call back you get "you were in a servery, but the time has expired, press 1 to remove your self from the list"
This happen to me about 3 weeks ago. I press 1 and still getting calls.
Caller ID came up as YAHOO but when I answered an automated system started up. It said that they were the Political Opinion Group and they were taking a political survey. When I heard something about being eligible for a prize, I hung up. Sounded like some sort of scam to me.