Receiving calls from this number on my cell at my work number, but there is no one on the line and when attempting to call back it indicates "NO ROUTES FOUND" and disconnnects.

I just got a call from this number on my spouse's phone asking for me. When I called the number is not working. Strange........

Keep getting phone calls from this number but no one responds.  When I call back the number just gives an odd busy signal.  Telemarketer??