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: 230

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-230 A Modesto CA SKTNCAGSGT0  6010 NEW CINGULAR WIRELESS PCS, LLC 738   2024-10-21   
350-230 0 Modesto CA   732J NUSO, LLC 738   2024-10-22   
350-230 1 Modesto CA   732J NUSO, LLC 738   2024-10-22   
350-230 2 Modesto CA   624H ONVOY SPECTRUM, LLC 738   2025-02-21   
350-230 3 Modesto CA   624H ONVOY SPECTRUM, LLC 738   2025-02-21   
350-230 4 Modesto CA   624H ONVOY SPECTRUM, LLC 738   2025-02-21   
350-230 5 Modesto CA   624H ONVOY SPECTRUM, LLC 738   2025-02-21   
350-230 6 Modesto CA   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2025-04-05   
350-230 7 Modesto CA   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2024-12-23   
350-230 8 Modesto CA   732J NUSO, LLC 738   2024-10-22   
350-230 9 Modesto CA   6010 NEW CINGULAR WIRELESS PCS, LLC 738   2024-10-21   

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

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