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

NXX: 420

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-420 A Lingle WY SCTSNEXUMMD  450F ONVOY, LLC - WY 646      
307-420 0 Lingle WY SCTSNEXUMMD  450F ONVOY, LLC - WY 646   2024-01-08   
307-420 1 Lingle WY SCTSNEXUMMD  450F ONVOY, LLC - WY 646   2023-07-23   
307-420 2 Lingle WY   6529 T-MOBILE USA, INC. 646   2025-04-03   
307-420 3 Lingle WY   6529 T-MOBILE USA, INC. 646   2025-05-25   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.