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.
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NPA: 737 [Rate centres in NPA 737] [Dial plan for NPA 737]

NXX: 433

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-433 A Bastrop TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558      
737-433 0 Bastrop TX AUSUTXNIGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2026-03-21   
737-433 6 Bastrop TX   883K AHOI LLC 558   2026-04-25   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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