I got a missed call from this number and called it back.  It said, "Hello, we need to speak with you about a very important matter.  Please stay on the line until the next available representative is able to assist you."  (or something similar to that) I stayed on the line, waiting... and it kept repeating itself, so I hung up.  My best guess... it's a debt collector.  I'm behind on some major hospital bills, but hey... I waited and apparently no representative was able to assist me.