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: 657 [Rate centres in NPA 657] [Dial plan for NPA 657]

NXX: 835

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-835 A Anaheim CA   6529 T-MOBILE USA, INC. 730   2026-01-10   
657-835 8 Anaheim CA   6529 T-MOBILE USA, INC. 730   2026-01-10   
657-835 9 Anaheim CA   6529 T-MOBILE USA, INC. 730   2026-01-10   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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