Telephone Area 312. Page 7.
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 | +1-312840-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312841-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312842-SSSS |
| New Cingular Wireless PCS | Du Page | Hinsdale, IL | +1-312844-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312845-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312846-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312848-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312849-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312850-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312851-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312852-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312853-SSSS |
| Rcn Telecom Services Of Illinois | Cook | Chicago, IL | +1-312854-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312855-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312856-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312857-SSSS |
| +1-312858-SSSS | |||
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312859-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312860-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312861-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312862-SSSS |
| Ovation Communications Of Illinois | Cook | Chicago, IL | +1-312863-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312864-SSSS |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1-312865-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312867-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312869-SSSS |
| Globalcom-il | Cook | Chicago, IL | +1-312870-SSSS |
| Mci Worldcom Communications | Cook | Chicago, IL | +1-312873-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312875-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312876-SSSS |
| Cook | +1-312877-SSSS | ||
| Peerless Network Of Illinois | Chicago, IL | +1-312878-SSSS | |
| Ameritech Illinois | Cook | Chicago, IL | +1-312879-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312880-SSSS |
| Ovation Communications Of Illinois | Cook | Chicago, IL | +1-312881-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312882-SSSS |
| Ovation Communications Of Illinois | Cook | Chicago, IL | +1-312884-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312886-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312887-SSSS |
| Geckotech | Chicago, IL | +1-312888-SSSS | |
| Sprint Spectrum L.p. | Cook | Chicago, IL | +1-312890-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312891-SSSS |
| Broadwing Communications | Cook | Chicago, IL | +1-312892-SSSS |
| Broadwing Communications | Cook | Chicago, IL | +1-312893-SSSS |
| Mcimetro Access Transmission Services LLC | Cook | Chicago, IL | +1-312894-SSSS |
| Broadwing Communications | Cook | Chicago, IL | +1-312895-SSSS |
| Broadwing Communications | Cook | Chicago, IL | +1-312896-SSSS |
| Cook | +1-312897-SSSS | ||
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312898-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312899-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312901-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312902-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312903-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312904-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312905-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312906-SSSS |
| Nextel Communications | Cook | Chicago, IL | +1-312907-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312908-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312909-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312910-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312912-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312913-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312914-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312915-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312916-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312917-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312919-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312920-SSSS |
| Ameritech Illinois | Chicago, IL | +1-312921-SSSS | |
| Ameritech Illinois | Cook | Chicago, IL | +1-312922-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312923-SSSS |
| Paetec Communications | Cook | Chicago, IL | +1-312924-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312925-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312926-SSSS |
| T-mobile Usa | Cook | Chicago, IL | +1-312927-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312928-SSSS |
| T-mobile Usa | Chicago, IL | +1-312929-SSSS | |
| Ameritech Illinois | Cook | Chicago, IL | +1-312930-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312931-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312932-SSSS |
