I rec'd a call from this number with no message. I tried to return the call, I got a message saying 911 cannot be used from my area to try from another phone.

I had the same experience.  911 message when i call it back and so I googled the number and did reverse lookup of the caller.  I found it to be tied somehow to:
AT&T Teleholdings Inc
AT&T Inc.
30 South Wacker Drive
Chicago, IL 60606-7487
United States
Tel:     1/312/750-3950
URL:     http://www.att.com
Formerly known as:
Ameritech Corporation

I called that company up and tried to find out if they have the number or if they have a customer that has/had the number and I couldn't get anywhere with them other than them supposedly reporting it.  

I wonder if this phone number should start getting posted on Craigslist and other sites to offer a great deal...maybe free sporting tickets.  
Maybe this would shut this crooked company down!

They called me twice in two hours. I did not answer and I will not call them back. If I happen to answer the phone by accident and it is them they will be a ear full

Caller ID

Same as previously reported callers.  I do not know this number.  A household employee answered the phone while I was out.  A male voice announced he was trying to "touch base" with me.  I performed a reverse lookup and found the above information.  I did not return the call.

I received a call from 708-946-0000 and it was a legitimate call.  It was my mechanic using a calling card.