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: 837

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-837 A Rancho Penasquitos CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732      
858-837 0 Rancho Penasquitos CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732      
858-837 1 Rancho Penasquitos CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732      
858-837 2 Rancho Penasquitos CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732      
858-837 3 Rancho Penasquitos CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732   2010-06-24   
858-837 4 Rancho Penasquitos CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732      
858-837 5 Rancho Penasquitos CA SNDGCA0260Z  624H ONVOY SPECTRUM, LLC 732   2021-07-19   
858-837 6 Rancho Penasquitos CA ESCNCAKYGT0  6529 T-MOBILE USA, INC. 732   2021-03-04   
858-837 7 Rancho Penasquitos CA ESCNCAKYGT0  6529 T-MOBILE USA, INC. 732   2021-03-04   
858-837 8 Rancho Penasquitos CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732   2014-07-12   
858-837 9 Rancho Penasquitos CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732      

Last updated: Wed, 01 Jun 2022 03:09:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.