Telephone Area 312. Page 2.
Prefix: +1312
This prefix is distributed within the state Illinois
The largest city in the region is Chicago
Time Zone: Central
Winter time: UTC-6
Summer time: UTC-5
Below on the map, there is indicated the largest city in the telephone area +1-312-...-.... Illinois Chicago.
Phone numbers +1-312-YYY-YYYY
| Company | District | Major City | Prefix |
|---|---|---|---|
| Ameritech Illinois | Cook | Chicago, IL | +1-312372-SSSS |
| Broadwing Communications | Cook | Chicago, IL | +1-312373-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312374-SSSS |
| T-mobile Usa | Cook | Chicago, IL | +1-312375-SSSS |
| Cbeyond Communications | Cook | Chicago, IL | +1-312376-SSSS |
| Xo Illinois | Cook | Chicago, IL | +1-312377-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312378-SSSS |
| Ovation Communications Of Illinois | Cook | Chicago, IL | +1-312379-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312380-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312381-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312382-SSSS |
| Cook | +1-312383-SSSS | ||
| Ameritech Illinois | Cook | Chicago, IL | +1-312384-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312385-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312386-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312387-SSSS |
| United States Cellular Corp. - Illinois | Cook | Chicago, IL | +1-312388-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312389-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312390-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312391-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312393-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312394-SSSS |
| AT&T Local | Cook | Chicago, IL | +1-312395-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312396-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312397-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312398-SSSS |
| Sprint Spectrum L.p. | Cook | Chicago, IL | +1-312399-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312400-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312401-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312402-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | La Grange Park, IL | +1-312403-SSSS |
| T-mobile Usa | Cook | Chicago, IL | +1-312404-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312405-SSSS |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1-312406-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312407-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312408-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312409-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312410-SSSS |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1-312412-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312413-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312415-SSSS |
| Mci Worldcom Communications | Cook | Chicago, IL | +1-312416-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312417-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312418-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312419-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312420-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312421-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312422-SSSS |
| Broadwing Communications | Cook | Chicago, IL | +1-312423-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312424-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312425-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312426-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312427-SSSS |
| Level 3 Communications | Cook | Chicago, IL | +1-312428-SSSS |
| Global Crossing Local Services-il | Cook | Chicago, IL | +1-312429-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312430-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312431-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312432-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312433-SSSS |
| Sprint Spectrum L.p. | +1-312434-SSSS | ||
| Ameritech Illinois | Cook | Chicago, IL | +1-312435-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312436-SSSS |
| United States Cellular Corp. - Illinois | Cook | Chicago, IL | +1-312437-SSSS |
| Cook | +1-312438-SSSS | ||
| Ameritech Illinois | Cook | Chicago, IL | +1-312440-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312441-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312442-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312443-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312444-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312445-SSSS |
| Nextel Communications | Cook | Chicago, IL | +1-312446-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312447-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312449-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312450-SSSS |
| T-mobile Usa | Cook | Chicago, IL | +1-312451-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312452-SSSS |
| Mci Worldcom Communications | Cook | Chicago, IL | +1-312453-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312454-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312455-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312456-SSSS |
