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: 556

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-556 A Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-556 0 Riverton WY CHYNWYRF2MD  939H COMMIO, LLC 654   2022-07-29   
307-556 1 Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2023-08-11   
307-556 2 Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2021-07-11   
307-556 3 Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2021-07-11   
307-556 4 Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2023-08-11   
307-556 5 Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2021-04-06   
307-556 6 Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2021-04-06   
307-556 7 Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2023-08-11   
307-556 8 Riverton WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2023-08-11   
307-556 9 Riverton WY CSPRWYMAXEX  6529 T-MOBILE USA, INC. 654   2022-03-31   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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