Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 657 [Rate centres in NPA 657] [Dial plan for NPA 657]

NXX: 857

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-857 A Orange CA   321J HD CARRIER LLC 730   2026-06-18   
657-857 0 Orange CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2026-06-19   
657-857 3 Orange CA   7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730   2026-07-10   
657-857 4 Orange CA   7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730   2026-07-10   
657-857 5 Orange CA   321J HD CARRIER LLC 730   2026-06-18   
657-857 6 Orange CA   321J HD CARRIER LLC 730   2026-06-18   
657-857 7 Orange CA   321J HD CARRIER LLC 730   2026-06-18   
657-857 8 Orange CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2026-06-19   
657-857 9 Orange CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2026-06-19   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

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