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: 449

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-449 A Rock Springs WY CHYNWYMAX6X  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2024-05-18   
307-449 0 Rock Springs WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2024-12-02   
307-449 1 Rock Springs WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2024-07-08   
307-449 2 Rock Springs WY CHYNWYMAXGX  624H ONVOY SPECTRUM, LLC 654   2025-01-20   
307-449 3 Rock Springs WY CHYNWYMAX6X  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2025-04-13   
307-449 4 Rock Springs WY CHYNWYMAX6X  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2026-04-25   
307-449 5 Rock Springs WY CHYNWYMAQMD  081F BANDWIDTH.COM CLEC, LLC - WY 654   2026-07-11   
307-449 7 Rock Springs WY CHYNWYRF8MD  321J HD CARRIER LLC 654   2025-11-21   
307-449 8 Rock Springs WY CHYNWYRF8MD  321J HD CARRIER LLC 654   2025-11-21   
307-449 9 Rock Springs WY CHYNWYMAX6X  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2024-05-19   

Last updated: Sun, 01 Nov 2026 02:11:49 UTC

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