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.

Switch: BLNGMTMAMMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-201 A Forsyth MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-208 A Billings MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-209 A Bozeman MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-220 A Livingston MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-305 A White Sulphur Springs MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-321 A Columbus MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-489 A Sidney MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-514 A Culbertson MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-536 A Bozeman MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650   2025-02-09   
406-539 A Bozeman MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-580 A Bozeman MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-617 A Billings MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650   2025-02-16   
406-699 A Hardin MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-743 A Laurel MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-749 A Colstrip MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-790 A Culbertson MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-818 A Red Lodge MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-850 A Billings MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-851 A Miles City MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-855 A Billings MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-860 A Billings MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-861 A Billings MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-891 A Baker MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-927 A Billings MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-940 A Molt MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-951 A Miles City MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-956 A Baker MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-989 A West Glendive MT 6010 NEW CINGULAR WIRELESS PCS, LLC 650      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.