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: 840 [Rate centres in NPA 840] [Dial plan for NPA 840]

NXX: 275

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
840-275 A Pomona CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-05-02   
840-275 0 Pomona CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-05-02   
840-275 1 Pomona CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-05-02   
840-275 2 Pomona CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-05-02   
840-275 6 Pomona CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-05-02   
840-275 8 Pomona CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-05-02   
840-275 9 Pomona CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2025-05-02   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.