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: 307 [Rate centres in NPA 307] [Dial plan for NPA 307]

NXX: 478

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-478 A La Grange WY   6529 T-MOBILE USA, INC. 646   2025-04-04   
307-478 8 La Grange WY   6529 T-MOBILE USA, INC. 646   2025-04-07   
307-478 9 La Grange WY   6529 T-MOBILE USA, INC. 646   2025-04-04   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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