Local Calling Guide

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

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-927 8 Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2014-05-08   
406-927 9 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2015-09-07   
406-928 A Grass Range MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-928 0 Grass Range MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-928 8 Grass Range MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-928 9 Grass Range MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-929 A Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-929 0 Hungry Horse MT MSSLMTMACMD  6529 T-MOBILE USA, INC. 648   2026-04-27   
406-929 1 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-15   
406-929 2 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-15   
406-929 3 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-15   
406-929 4 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-04-21   
406-929 5 Hungry Horse MT MSSLMTMACMD  6529 T-MOBILE USA, INC. 648   2024-06-22   
406-929 6 Hungry Horse MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648   2023-09-18   
406-929 7 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2007-09-21   
406-929 8 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2011-04-06   
406-929 9 Hungry Horse MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648   2023-09-18   
406-930 A Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-930 0 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-930 1 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-930 2 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-930 3 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2023-12-29   
406-930 4 Big Timber MT BLNGMT939MD  145J TERRA NOVA TELECOM INC. 650   2026-01-04   
406-930 6 Big Timber MT   145J TERRA NOVA TELECOM INC. 650   2025-06-07   
406-930 9 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2024-06-14   
406-931 A Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-931 0 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-931 1 Big Timber MT BLNGMTWE6MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2019-01-11   
406-931 9 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2025-11-13   
406-932 A Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 0 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 2 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 3 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 4 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 5 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 6 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 7 Big Timber MT BLNGMT93HMD  792K CHARTER IP ENABLED SERVICES, LLC 650   2017-05-20   
406-932 8 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-933 A Helena MT CLNCMTMARS1  9636 QWEST CORPORATION 648      
406-933 3 Helena MT   145J TERRA NOVA TELECOM INC. 648   2025-10-06   
406-933 4 Helena MT GRFLMTMAYMD  145J TERRA NOVA TELECOM INC. 648   2026-06-05   
406-933 5 Helena MT CLNCMTMARS1  9636 QWEST CORPORATION 648      
406-933 8 Helena MT CLNCMTMARS1  9636 QWEST CORPORATION 648      
406-933 9 Helena MT CLNCMTMARS1  9636 QWEST CORPORATION 648      
406-934 A Miles City MT BLNGMTWERMD  743G WIDE VOICE, LLC - MT 650      
406-934 0 Miles City MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-934 1 Miles City MT BLNGMTWERMD  743G WIDE VOICE, LLC - MT 650   2025-07-22   
406-934 8 Miles City MT BLNGMTWEDMD  624H ONVOY SPECTRUM, LLC 650   2025-01-16   
406-934 9 Miles City MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-935 A Broadus MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      

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Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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