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: 350 [Rate centres in NPA 350] [Dial plan for NPA 350]

NXX: 900

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-900 A Tracy CA SKTNCA01XKZ  624H ONVOY SPECTRUM, LLC 738   2024-01-19   
350-900 0 Tracy CA SKTNCA01XKZ  624H ONVOY SPECTRUM, LLC 738   2024-01-19   
350-900 1 Tracy CA SKTNCA01XFY  649C ONVOY, LLC - CA 738   2024-01-20   
350-900 2 Tracy CA   649C ONVOY, LLC - CA 738   2024-02-24   
350-900 3 Tracy CA   649C ONVOY, LLC - CA 738   2024-02-24   
350-900 4 Tracy CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2024-03-23   
350-900 7 Tracy CA   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 738   2024-02-20   
350-900 8 Tracy CA SKTNCA01XFY  649C ONVOY, LLC - CA 738   2024-01-20   
350-900 9 Tracy CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2024-01-29   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.