I looked into this about a year ago. From what I could find was that the only people that have access to this service is the emergency response, and the phone companies themselves. This info is not even available to the customer service phone employees.

You would need a subpeona to take to the phone companies who would then have to get it from a special system locked in a private room.

Out of curiousity what system have you seen at the spy shops to do this?