Area Code (312) Information:

State: Illinois - IL

Major Cities: Chicago, Calumet Park, Ashburn Park, Blue Island, Evanston, Northbrook, Wheeling, Naperville

Major Carriers: United States Cellular Corp., T-mobile Usa, Inc., Broadwing Communications, Llc - Il, Access One, Inc. - Il, Pac-west Telecomm, Inc. - Il, New Cingular Wireless Pcs, Llc - Il, Nextel Communications, Inc., Cbeyond Communications, Llc-il, Ameritech Illinois, Sprint Spectrum L.p., Cimco Communications, Inc. - Il, Ovation Communications Of Illinois, Inc., Rcn Telecom Services Of Illinois, Inc. - Il, Paetec Communications, Inc. - Il, Teleport Communications Group - Chicago, Level 3 Communications, Llc - Il, Allegiance Telecom, Inc. - Il, Mci Worldcom Communications, Inc. - Il, At&t Local, 2nd Century Communications, Inc. - Il