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: 998

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-998 A Stockton CA SKTNCA01XFY  649C ONVOY, LLC - CA 738   2026-07-23   
350-998 0 Stockton CA SKTNCA01XFY  649C ONVOY, LLC - CA 738   2026-07-23   
350-998 1 Stockton CA   649C ONVOY, LLC - CA 738   2026-09-04   
350-998 2 Stockton CA   649C ONVOY, LLC - CA 738   2026-09-04   
350-998 3 Stockton CA   649C ONVOY, LLC - CA 738   2026-09-04   
350-998 4 Stockton CA   649C ONVOY, LLC - CA 738   2026-09-04   
350-998 5 Stockton CA   981E BANDWIDTH.COM CLEC, LLC - CA 738   2026-09-12   
350-998 6 Stockton CA   6529 T-MOBILE USA, INC. 738   2026-08-03   
350-998 7 Stockton CA   6529 T-MOBILE USA, INC. 738   2026-08-03   
350-998 8 Stockton CA   649C ONVOY, LLC - CA 738   2026-08-02   
350-998 9 Stockton CA   649C ONVOY, LLC - CA 738   2026-08-02   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.