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: 250

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-250 A Tracy CA SKTNCA01XFY  649C ONVOY, LLC - CA 738      
350-250 0 Tracy CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2022-11-29   
350-250 1 Tracy CA   073H TELNYX LLC 738   2023-10-16   
350-250 2 Tracy CA   649C ONVOY, LLC - CA 738   2022-11-28   
350-250 3 Tracy CA   649C ONVOY, LLC - CA 738   2022-11-28   
350-250 4 Tracy CA   649C ONVOY, LLC - CA 738   2022-11-28   
350-250 5 Tracy CA   649C ONVOY, LLC - CA 738   2022-11-28   
350-250 6 Tracy CA   939H COMMIO, LLC 738   2022-11-29   
350-250 7 Tracy CA   649C ONVOY, LLC - CA 738   2022-11-28   
350-250 8 Tracy CA   649C ONVOY, LLC - CA 738   2022-11-28   
350-250 9 Tracy CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2023-08-15   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.