Whatever the caller is up to, they are still doing it.    Called my 605 area code cell phone and after two rings the call was disconnected (by the caller)  -- apparently the robo-dialer got a little ahead of the representatives.    I see on another reporting website that the calls have something to do with signing up for a rewards program.   The calls are definitely illegal and likely a scam.   "NO NAME" came through as the called ID name.