Telephone Area 312. Page 1.
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 |
|---|---|---|---|
| Nextel Communications | Cook | Chicago, IL | +1-312287-SSSS |
| Mcimetro Access Transmission Services LLC | Cook | Chicago, IL | +1-312288-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312289-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312290-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312291-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312293-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312294-SSSS |
| Usa Mobility Wireless | Cook | La Grange Park, IL | +1-312295-SSSS |
| Nextel Communications | Cook | Chicago, IL | +1-312296-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312297-SSSS |
| Sigecom | Cook | Chicago, IL | +1-312298-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312299-SSSS |
| Net Talk.com | Cook | +1-312300-SSSS | |
| New Cingular Wireless PCS | Du Page | Hinsdale, IL | +1-312301-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312302-SSSS |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1-312303-SSSS |
| New Cingular Wireless PCS | Du Page | Hinsdale, IL | +1-312304-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Northbrook, IL | +1-312305-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312306-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312307-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312308-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312309-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Northbrook, IL | +1-312310-SSSS |
| Cook | +1-312313-SSSS | ||
| New Cingular Wireless PCS | Du Page | Hinsdale, IL | +1-312314-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312315-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312316-SSSS |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1-312317-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | La Grange Park, IL | +1-312318-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312320-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312321-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312322-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312323-SSSS |
| Level 3 Communications | Cook | Chicago, IL | +1-312324-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312325-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312326-SSSS |
| Xo Illinois | Cook | Chicago, IL | +1-312327-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312328-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312329-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312330-SSSS |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1-312331-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312332-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312333-SSSS |
| Globalcom-il | Cook | Chicago, IL | +1-312334-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312335-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312336-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312337-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312338-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312339-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312341-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312342-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312343-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312344-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312345-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312346-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312347-SSSS |
| Neutral Tandem-illinois | Cook | Chicago, IL | +1-312348-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312349-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312350-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312351-SSSS |
| New Cingular Wireless PCS | Du Page | Hinsdale, IL | +1-312352-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312353-SSSS |
| New Cingular Wireless PCS | Du Page | Roselle, IL | +1-312354-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312355-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312356-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312357-SSSS |
| Cook | +1-312358-SSSS | ||
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312359-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312360-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312361-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312362-SSSS |
| Rcn Telecom Services Of Illinois | Cook | Chicago, IL | +1-312363-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312364-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312365-SSSS |
| Usa Mobility Wireless | Cook | La Grange Park, IL | +1-312366-SSSS |
| Usa Mobility Wireless | Cook | La Grange Park, IL | +1-312367-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312368-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312369-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312370-SSSS |
| Sprint Spectrum L.p. | Cook | Chicago, IL | +1-312371-SSSS |
