Illinois
Area codes
2
Rate centres
55
Carriers
33
Prefix blocks
1,029
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.
33 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC | 224C | 241 | 23.4% |
| UNITED STATES CELLULAR - IL | 6265 | 125 | 12.1% |
| FRONTIER NORTH, INC. - IL | 1015 | 111 | 10.8% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 111 | 10.8% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 63 | 6.1% |
| T-MOBILE USA, INC. | 6529 | 54 | 5.2% |
| COMMIO, LLC | 939H | 48 | 4.7% |
| ONVOY SPECTRUM, LLC | 624H | 48 | 4.7% |
| ILLINOIS BELL TEL CO | 9329 | 40 | 3.9% |
| TELNYX LLC | 073H | 31 | 3.0% |
| ADAMS TELSYSTEMS, INC. | 7091 | 19 | 1.8% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 19 | 1.8% |
| FRONTIER COMMUNICATIONS-MIDLAND, INC. | 1055 | 15 | 1.5% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 14 | 1.4% |
| ADAMS TEL. COOP. | 0976 | 12 | 1.2% |
| FRONTIER COMMUNICATIONS-SCHUYLER, INC. - IL | 1079 | 9 | 0.9% |
| PAETEC ITEL, LLC | 829J | 9 | 0.9% |
| AT&T CORP. | 516C | 8 | 0.8% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 7 | 0.7% |
| MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | 7 | 0.7% |
| METROPCS, INC. | 5562 | 6 | 0.6% |
| NUSO, LLC | 732J | 5 | 0.5% |
| COMCAST IP PHONE, LLC | 318J | 4 | 0.4% |
| AHOI LLC | 883K | 3 | 0.3% |
| NUSO, LLC | 551G | 3 | 0.3% |
55 rate centres. search them all.