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: 406 [Rate centres in NPA 406] [Dial plan for NPA 406]

NXX: 792

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-792 A Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-792 0 Butte MT MSSLMTMAYMD  771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2019-05-27   
406-792 1 Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-792 2 Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2019-06-20   
406-792 3 Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2020-10-05   
406-792 4 Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2020-10-05   
406-792 5 Butte MT HLNAMTMAWMD  6529 T-MOBILE USA, INC. 648   2017-05-25   
406-792 6 Butte MT HLNAMTMAWMD  6529 T-MOBILE USA, INC. 648   2017-05-25   
406-792 7 Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2014-04-14   
406-792 8 Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2014-04-14   
406-792 9 Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2020-10-05   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.