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: 823

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-823 A Cheyenne WY CHYNWYMAX9X  879G TELEPORT COMMUNICATIONS AMERICA WY-LLC 654      
307-823 0 Cheyenne WY   6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654   2023-12-27   
307-823 1 Cheyenne WY   6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654   2023-12-27   
307-823 2 Cheyenne WY   6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654   2015-02-28   
307-823 3 Cheyenne WY   6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654   2015-03-29   
307-823 6 Cheyenne WY   879G TELEPORT COMMUNICATIONS AMERICA WY-LLC 654   2012-09-27   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.