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: 381

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-381 A Sheridan WY CHYNWYMAQMD  081F BANDWIDTH.COM CLEC, LLC - WY 654      
307-381 0 Sheridan WY   081F BANDWIDTH.COM CLEC, LLC - WY 654   2021-06-25   
307-381 1 Sheridan WY   081F BANDWIDTH.COM CLEC, LLC - WY 654   2021-06-25   
307-381 2 Sheridan WY   450F ONVOY, LLC - WY 654   2021-08-27   
307-381 3 Sheridan WY   450F ONVOY, LLC - WY 654   2021-08-27   
307-381 4 Sheridan WY   450F ONVOY, LLC - WY 654   2022-01-02   
307-381 5 Sheridan WY   450F ONVOY, LLC - WY 654   2022-01-02   
307-381 6 Sheridan WY   081F BANDWIDTH.COM CLEC, LLC - WY 654   2022-11-24   
307-381 7 Sheridan WY   197D VONAGE AMERICA LLC 654   2022-07-18   
307-381 8 Sheridan WY   6529 T-MOBILE USA, INC. 654   2022-03-31   
307-381 9 Sheridan WY   6529 T-MOBILE USA, INC. 654   2022-03-31   

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

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