Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 307 [Rate centres in NPA 307] [Dial plan for NPA 307]

NXX: 490

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-490 A Upton WY   792K CHARTER IP ENABLED SERVICES, LLC 654   2026-04-26   
307-490 1 Upton WY   792K CHARTER IP ENABLED SERVICES, LLC 654   2026-04-26   

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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