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: 660

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-660 A Dillon MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-660 0 Dillon MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-660 1 Dillon MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-660 2 Dillon MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-660 3 Dillon MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-660 4 Dillon MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-660 5 Dillon MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-660 6 Dillon MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-660 7 Dillon MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-660 8 Dillon MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.