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: 858 [Rate centres in NPA 858] [Dial plan for NPA 858]

NXX: 740

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-740 A San Diego: Mira Mesa DA CA SNDGCA07DS1  7421 AT&T LOCAL 732      
858-740 0 San Diego: Mira Mesa DA CA VISTCA65CM0  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2007-03-25   
858-740 1 San Diego: Mira Mesa DA CA VISTCA65CM0  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2007-05-25   
858-740 2 San Diego: Mira Mesa DA CA SNDGCA07DS1  7421 AT&T LOCAL 732      
858-740 3 San Diego: Mira Mesa DA CA SNDJCA05DS3  7262 XO CALIFORNIA, INC. 732   2008-09-22   
858-740 4 San Diego: Mira Mesa DA CA VISTCA65CM0  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2005-03-05   
858-740 5 San Diego: Mira Mesa DA CA SNDACA96DS0  7147 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 732   2008-12-08   
858-740 6 San Diego: Mira Mesa DA CA VISTCA65CM0  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2005-06-23   
858-740 7 San Diego: Mira Mesa DA CA VISTCA65CM0  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2005-03-05   
858-740 8 San Diego: Mira Mesa DA CA VISTCA65CM0  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2005-06-23   
858-740 9 San Diego: Mira Mesa DA CA VISTCA65CM0  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2009-11-03   

Last updated: Tue, 04 May 2021 15:04:27 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.