The number leads back to something called predicto.com. I called both predicto and heycosmo and told them they contacted an secure internal government mobile phone and they were kind of scared when i threatened legal action.
This number called my cell as well, and after some research, discovered it was ported from the recommendation above (877/903-2505) and is now held by Paetec, a phone company. Simply give them a call and they will take you of their list.
Received call on 12/03/2008 @ 4:03 pm. Did not pick up call or respond back since did not recognize the number or area code. Just submitted a complaint to National Do Not Call List.