Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 406 [Rate centres in NPA 406] [Dial plan for NPA 406]

NXX: 964

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-964 A Great Falls MT VGHNMTMARS1  9636 QWEST CORPORATION 648      
406-964 0 Great Falls MT   9636 QWEST CORPORATION 648      
406-964 1 Great Falls MT   9636 QWEST CORPORATION 648      
406-964 2 Great Falls MT   624H ONVOY SPECTRUM, LLC 648   2021-10-30   
406-964 3 Great Falls MT   624H ONVOY SPECTRUM, LLC 648   2021-10-30   
406-964 4 Great Falls MT   453F ONVOY, LLC - MT 648   2020-10-05   
406-964 5 Great Falls MT   453F ONVOY, LLC - MT 648   2020-10-05   
406-964 6 Great Falls MT   453F ONVOY, LLC - MT 648   2020-10-05   
406-964 7 Great Falls MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648   2024-11-10   
406-964 8 Great Falls MT   9636 QWEST CORPORATION 648      
406-964 9 Great Falls MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648   2023-12-23   

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

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