This number has been calling me for the past 3 days.  The first day, I missed the calls...they made 2 calls immediately after each other.  They didn't leave a message so I disregarded it.  The next day, they called again but I was on a phone call and couldn't answer.  Again, no message, so I called the number back after finishing with my phone call.  It says, "the Google subscriber you're trying to reach is unable to accept your call, please leave a message."  I just hung up.  Today, 3/25/15, they called again and I finally answered but no one was on the other line!  I kept saying hello...and the call lasted about 20 seconds with me repeatedly saying, "hello" and then they hung up on me.  Verrrrry Strange!