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.

Midwest, WY

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
307-305 A CSPRWYMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 654      
307-305 8 CSPRWYMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2021-04-19   
307-305 9 CSPRWYMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2021-04-19   
307-437 A MDWSWYXCRS1  3410 RT COMMUNICATIONS 654      

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

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