California
Area codes
2
Rate centres
22
Carriers
49
Prefix blocks
3,117
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.
49 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - CA | 649C | 421 | 13.5% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 376 | 12.1% |
| T-MOBILE USA, INC. | 6529 | 349 | 11.2% |
| PACIFIC BELL | 9740 | 245 | 7.9% |
| FRONTIER CALIFORNIA INC. | 2319 | 212 | 6.8% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 209 | 6.7% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 174 | 5.6% |
| METROPCS, INC. | 5562 | 128 | 4.1% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 110 | 3.5% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 100 | 3.2% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 88 | 2.8% |
| ONVOY SPECTRUM, LLC | 624H | 80 | 2.6% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 66 | 2.1% |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 53 | 1.7% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 52 | 1.7% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 47 | 1.5% |
| NORCAST COMMUNICATIONS CORPORATION - CA | 9807 | 41 | 1.3% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | 41 | 1.3% |
| FRACTEL, LLC | 965H | 35 | 1.1% |
| TELNYX LLC | 073H | 35 | 1.1% |
| CHARTER IP ENABLED SERVICES, LLC | 792K | 33 | 1.1% |
| HD CARRIER LLC | 321J | 32 | 1.0% |
| COMMIO, LLC | 939H | 28 | 0.9% |
| TERRA NOVA TELECOM INC. | 145J | 16 | 0.5% |
| YMAX COMMUNICATIONS CORP. - CA | 258E | 16 | 0.5% |
22 rate centres. search them all.