Illinois
Area codes
2
Rate centres
55
Carriers
48
Prefix blocks
1,920
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.
48 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC | 224C | 375 | 19.5% |
| ILLINOIS BELL TEL CO | 9329 | 238 | 12.4% |
| T-MOBILE USA, INC. | 6529 | 162 | 8.4% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 143 | 7.4% |
| FRONTIER NORTH, INC. - IL | 1015 | 124 | 6.5% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 104 | 5.4% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 92 | 4.8% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 89 | 4.6% |
| ONVOY SPECTRUM, LLC | 624H | 83 | 4.3% |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | 68 | 3.5% |
| COMCAST IP PHONE, LLC | 318J | 59 | 3.1% |
| STRATUS NETWORKS | 495J | 52 | 2.7% |
| TELNYX LLC | 073H | 49 | 2.6% |
| TERRA NOVA TELECOM INC. | 145J | 32 | 1.7% |
| FRONTIER COMMUNICATIONS OF MT. PULASKI, INC. | 1061 | 27 | 1.4% |
| COMMIO, LLC | 939H | 24 | 1.3% |
| FRACTEL, LLC | 965H | 24 | 1.3% |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 22 | 1.1% |
| PAETEC ITEL, LLC | 829J | 19 | 1.0% |
| MCC TELEPHONY LLC | 593K | 16 | 0.8% |
| AT&T CORP. | 516C | 14 | 0.7% |
| FRONTIER COMMUNICATIONS-MIDLAND, INC. | 1055 | 11 | 0.6% |
| FRONTIER COMMUNICATIONS OF ILLINOIS, INC. | 1038 | 10 | 0.5% |
| METROPCS, INC. | 5562 | 10 | 0.5% |
| TON80 COMMUNICATIONS, LLC | 516J | 9 | 0.5% |
55 rate centres. search them all.