Illinois
Area codes
2
Rate centres
41
Carriers
41
Prefix blocks
1,240
A Local Access and Transport Area is the region a call is routed within before it becomes long-haul. The boundaries were drawn when the Bell System was broken up in 1984: a local carrier could carry a call inside its LATA, and a long-distance carrier had to take it across one. The division still shapes how calls are routed and rated today, which is why every prefix block on this site carries a LATA.
41 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC | 224C | 169 | 13.6% |
| T-MOBILE USA, INC. | 6529 | 155 | 12.5% |
| FRONTIER NORTH, INC. - IL | 1036 | 108 | 8.7% |
| UNITED STATES CELLULAR - IL | 6265 | 97 | 7.8% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 84 | 6.8% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 70 | 5.6% |
| CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL | 1183 | 59 | 4.8% |
| METROPCS, INC. | 5562 | 48 | 3.9% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 46 | 3.7% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 41 | 3.3% |
| ONVOY SPECTRUM, LLC | 624H | 38 | 3.1% |
| STRATUS NETWORKS | 495J | 38 | 3.1% |
| ILLINOIS BELL TEL CO | 9329 | 36 | 2.9% |
| BRIGHTSPEED OF ILLINOIS, LLC | 1057 | 35 | 2.8% |
| COMCAST IP PHONE, LLC | 318J | 33 | 2.7% |
| MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | 33 | 2.7% |
| TELNYX LLC | 073H | 33 | 2.7% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 29 | 2.3% |
| AERO NORTH COMMUNICATIONS, INC. - IL | 443F | 15 | 1.2% |
| YMAX COMMUNICATIONS CORP. - IL | 259E | 11 | 0.9% |
| FRACTEL, LLC | 965H | 8 | 0.6% |
| DIGITAL NETWORK ACCESS COMMUNICATIONS, INC. - IL | 972C | 7 | 0.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 6 | 0.5% |
| NUSO, LLC | 732J | 5 | 0.4% |
| AT&T CORP. | 516C | 3 | 0.2% |
41 rate centres. search them all.