Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 307 [Rate centres in NPA 307] [Dial plan for NPA 307]

NXX: 394

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-394 A Casper WY CSPRWYMAXEX  6529 T-MOBILE USA, INC. 654      
307-394 0 Casper WY CHYNWY07GMD  5562 METROPCS, INC. 654   2021-11-11   
307-394 1 Casper WY CSPRWYMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2021-11-14   
307-394 2 Casper WY CSPRWYMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2021-11-14   
307-394 3 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2021-08-27   
307-394 4 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2021-08-27   
307-394 5 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2021-08-27   
307-394 6 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2021-08-27   
307-394 7 Casper WY CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654   2023-09-23   
307-394 8 Casper WY CHYNWYMAXGX  624H ONVOY SPECTRUM, LLC 654   2021-11-20   
307-394 9 Casper WY CSPRWYMAXEX  6529 T-MOBILE USA, INC. 654   2021-07-23   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.