Illinois
Area codes
2
Rate centres
59
Carriers
42
Prefix blocks
2,063
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.
42 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC | 224C | 405 | 19.6% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 300 | 14.5% |
| T-MOBILE USA, INC. | 6529 | 173 | 8.4% |
| ILLINOIS BELL TEL CO | 9329 | 142 | 6.9% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 135 | 6.5% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 102 | 4.9% |
| FRONTIER NORTH, INC. - IL | 1015 | 88 | 4.3% |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | 85 | 4.1% |
| FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL | 1000 | 79 | 3.8% |
| ONVOY SPECTRUM, LLC | 624H | 70 | 3.4% |
| TELNYX LLC | 073H | 65 | 3.2% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 53 | 2.6% |
| COMCAST IP PHONE, LLC | 318J | 47 | 2.3% |
| FRACTEL, LLC | 965H | 42 | 2.0% |
| PAETEC ITEL, LLC | 829J | 35 | 1.7% |
| TERRA NOVA TELECOM INC. | 145J | 32 | 1.6% |
| MCC TELEPHONY LLC | 593K | 29 | 1.4% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 28 | 1.4% |
| COMMIO, LLC | 939H | 19 | 0.9% |
| AT&T CORP. | 516C | 16 | 0.8% |
| METROPCS, INC. | 5562 | 15 | 0.7% |
| IP HORIZON LLC | 515J | 14 | 0.7% |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 12 | 0.6% |
| TON80 COMMUNICATIONS, LLC | 516J | 12 | 0.6% |
| FRONTIER NORTH, INC. - IL | 1036 | 11 | 0.5% |
59 rate centres. search them all.