California
Area codes
4
Rate centres
40
Carriers
57
Prefix blocks
14,999
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.
57 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| T-MOBILE USA, INC. | 6529 | 2,485 | 16.6% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 1,832 | 12.2% |
| ONVOY, LLC - CA | 649C | 1,831 | 12.2% |
| PACIFIC BELL | 9740 | 1,486 | 9.9% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 1,368 | 9.1% |
| METROPCS, INC. | 5562 | 880 | 5.9% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 836 | 5.6% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 604 | 4.0% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | 533 | 3.6% |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 506 | 3.4% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7147 | 352 | 2.3% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 323 | 2.2% |
| ONVOY SPECTRUM, LLC | 624H | 234 | 1.6% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 225 | 1.5% |
| PAETEC ITEL, LLC | 829J | 196 | 1.3% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 154 | 1.0% |
| COMMIO, LLC | 939H | 134 | 0.9% |
| TWC IP ENABLED SERVICES, LLC | 793K | 124 | 0.8% |
| IP HORIZON LLC | 515J | 109 | 0.7% |
| AT&T CORP. | 516C | 104 | 0.7% |
| FRACTEL, LLC | 965H | 102 | 0.7% |
| TELNYX LLC | 073H | 95 | 0.6% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 87 | 0.6% |
| TERRA NOVA TELECOM INC. | 145J | 66 | 0.4% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 49 | 0.3% |
40 rate centres. search them all.