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: 224

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-224 A Atwater CA SKTNCAGSGT0  6010 NEW CINGULAR WIRELESS PCS, LLC 738   2024-07-20   
350-224 0 Atwater CA SKTOCAOY6MD  6529 T-MOBILE USA, INC. 738   2024-11-16   
350-224 1 Atwater CA TRLCCA160MD  776C CHARTER FIBERLINK CA-CCO, LLC - CA 738   2024-08-13   
350-224 2 Atwater CA   6529 T-MOBILE USA, INC. 738   2025-06-20   
350-224 3 Atwater CA SKTOCAOY6MD  6529 T-MOBILE USA, INC. 738   2024-09-15   
350-224 4 Atwater CA SKTNCACZ7MD  145J TERRA NOVA TELECOM INC. 738   2024-08-08   
350-224 5 Atwater CA SKTOCAOY6MD  6529 T-MOBILE USA, INC. 738   2024-09-15   
350-224 6 Atwater CA SKTOCAOY6MD  6529 T-MOBILE USA, INC. 738   2024-09-15   
350-224 7 Atwater CA SKTOCAOY6MD  6529 T-MOBILE USA, INC. 738   2024-07-21   
350-224 8 Atwater CA SKTOCAOY6MD  6529 T-MOBILE USA, INC. 738   2024-07-21   
350-224 9 Atwater CA SKTNCAGSGT0  6010 NEW CINGULAR WIRELESS PCS, LLC 738   2024-07-20   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.