Arizona, California
Area codes
21
Rate centres
207
Carriers
86
Prefix blocks
82,526
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.
86 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| T-MOBILE USA, INC. | 6529 | 13,201 | 16.0% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 12,138 | 14.7% |
| ONVOY, LLC - CA | 649C | 9,809 | 11.9% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 7,682 | 9.3% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 5,842 | 7.1% |
| PACIFIC BELL | 9740 | 5,553 | 6.7% |
| METROPCS NETWORKS, LLC | 899D | 5,534 | 6.7% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 3,268 | 4.0% |
| FRONTIER CALIFORNIA INC. | 2319 | 2,067 | 2.5% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 1,823 | 2.2% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 1,543 | 1.9% |
| ONVOY SPECTRUM, LLC | 624H | 1,479 | 1.8% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 1,385 | 1.7% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | 1,279 | 1.5% |
| TWC IP ENABLED SERVICES, LLC | 793K | 1,229 | 1.5% |
| PAETEC ITEL, LLC | 829J | 918 | 1.1% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 891 | 1.1% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | 764 | 0.9% |
| FRACTEL, LLC | 965H | 709 | 0.9% |
| IP HORIZON LLC | 515J | 506 | 0.6% |
| TELNYX LLC | 073H | 451 | 0.5% |
| COMMIO, LLC | 939H | 442 | 0.5% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 437 | 0.5% |
| CHARTER IP ENABLED SERVICES, LLC | 792K | 306 | 0.4% |
| FRONTIER CALIFORNIA INC. | 4420 | 288 | 0.3% |
207 rate centres. search them all.