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   6529 T-MOBILE USA, INC. 558   2026-02-19   
737-433 7 Bastrop TX   6529 T-MOBILE USA, INC. 558   2026-02-19   
737-433 8 Bastrop TX   6529 T-MOBILE USA, INC. 558   2026-02-19   
737-433 9 Bastrop TX   6529 T-MOBILE USA, INC. 558   2026-02-19   

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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