Local Calling Guide

Area code/prefix search

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Shirley Basin, WY

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
307-356 A SYBNWYXCRS1  2297 UNION TEL. CO. 654      
307-489 A CHYNWYMAX6X  6010 NEW CINGULAR WIRELESS PCS, LLC 654      
307-489 8   6010 NEW CINGULAR WIRELESS PCS, LLC 654   2018-07-29   
307-489 9   6010 NEW CINGULAR WIRELESS PCS, LLC 654   2018-07-29   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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