Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 657 [Rate centres in NPA 657] [Dial plan for NPA 657]

NXX: 827

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-827 A Silverado CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-10-19   
657-827 0 Silverado CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-10-19   
657-827 1 Silverado CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-10-19   
657-827 2 Silverado CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-10-19   
657-827 3 Silverado CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-10-19   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.