hey, NCcichlid
i just found all of this info here:
http://www.nanpa.com/hope it helps
-Chris
here it is:
Service codes, commonly called N11 codes because of their format, are used to provide three-digit dialing access special services.
In the U.S., the FCC administers N11 codes, and recognizes only 211, 311, 511, and 711 as nationally assigned. Other codes have traditional uses as shown in the table below.
N11 CODE DESCRIPTION:
211 Community Information and Referral Services (US)
311 Non-Emergency Police and Other Governmental Services (US)
411 Local Directory Assistance
511 Traffic and Transportation Information (US); Reserved (Canada)
611 Repair Service
711 Telecommunications Relay Service (TRS)
811 Business Office
911 Emergency