Telephone Area +1 (312) XXX-XXXX / 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.
In the United States, telephone numbers are divided into a country code (+1), an area code (or prefix), which is three digits long, and a subscriber number (seven digits). These are just a few examples, and there are over 300 area codes in the United States. Each code can cover both large cities and less populated areas depending on population density and telephone network distribution.
Phone numbers +1 (312) XXX-XXXX
| Company | District | Major City | Prefix |
|---|---|---|---|
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 372-XXXX |
| Broadwing Communications | Cook | Chicago, IL | +1 (312) 373-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 374-XXXX |
| T-mobile Usa | Cook | Chicago, IL | +1 (312) 375-XXXX |
| Cbeyond Communications | Cook | Chicago, IL | +1 (312) 376-XXXX |
| Xo Illinois | Cook | Chicago, IL | +1 (312) 377-XXXX |
| Usa Mobility Wireless | Cook | Chicago, IL | +1 (312) 378-XXXX |
| Ovation Communications Of Illinois | Cook | Chicago, IL | +1 (312) 379-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 380-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 381-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 382-XXXX |
| Cook | +1 (312) 383-XXXX | ||
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 384-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 385-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 386-XXXX |
| Usa Mobility Wireless | Cook | Chicago, IL | +1 (312) 387-XXXX |
| United States Cellular Corp. - Illinois | Cook | Chicago, IL | +1 (312) 388-XXXX |
| Usa Mobility Wireless | Cook | Chicago, IL | +1 (312) 389-XXXX |
| American Messaging (am) | Cook | Chicago, IL | +1 (312) 390-XXXX |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1 (312) 391-XXXX |
| American Messaging (am) | Cook | Chicago, IL | +1 (312) 393-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 394-XXXX |
| AT&T Local | Cook | Chicago, IL | +1 (312) 395-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 396-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 397-XXXX |
| Usa Mobility Wireless | Cook | Chicago, IL | +1 (312) 398-XXXX |
| Sprint Spectrum L.p. | Cook | Chicago, IL | +1 (312) 399-XXXX |
| American Messaging (am) | Cook | Chicago, IL | +1 (312) 400-XXXX |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1 (312) 401-XXXX |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1 (312) 402-XXXX |
| Cellco Partnership DBA Verizon Wireless | Cook | La Grange Park, IL | +1 (312) 403-XXXX |
| T-mobile Usa | Cook | Chicago, IL | +1 (312) 404-XXXX |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1 (312) 405-XXXX |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1 (312) 406-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 407-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 408-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 409-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 410-XXXX |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1 (312) 412-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 413-XXXX |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1 (312) 415-XXXX |
| Mci Worldcom Communications | Cook | Chicago, IL | +1 (312) 416-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 417-XXXX |
| Usa Mobility Wireless | Cook | Chicago, IL | +1 (312) 418-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 419-XXXX |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1 (312) 420-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 421-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 422-XXXX |
| Broadwing Communications | Cook | Chicago, IL | +1 (312) 423-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 424-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 425-XXXX |
| Usa Mobility Wireless | Cook | Chicago, IL | +1 (312) 426-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 427-XXXX |
| Level 3 Communications | Cook | Chicago, IL | +1 (312) 428-XXXX |
| Global Crossing Local Services-il | Cook | Chicago, IL | +1 (312) 429-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 430-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 431-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 432-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 433-XXXX |
| Sprint Spectrum L.p. | +1 (312) 434-XXXX | ||
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 435-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 436-XXXX |
| United States Cellular Corp. - Illinois | Cook | Chicago, IL | +1 (312) 437-XXXX |
| Cook | +1 (312) 438-XXXX | ||
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 440-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 441-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 442-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 443-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 444-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 445-XXXX |
| Nextel Communications | Cook | Chicago, IL | +1 (312) 446-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 447-XXXX |
| American Messaging (am) | Cook | Chicago, IL | +1 (312) 449-XXXX |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1 (312) 450-XXXX |
| T-mobile Usa | Cook | Chicago, IL | +1 (312) 451-XXXX |
| American Messaging (am) | Cook | Chicago, IL | +1 (312) 452-XXXX |
| Mci Worldcom Communications | Cook | Chicago, IL | +1 (312) 453-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 454-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 455-XXXX |
| Ameritech Illinois | Cook | Chicago, IL | +1 (312) 456-XXXX |
