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
406-393 9 Somers MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-03-07   
406-394 A North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 0 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 1 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 2 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 3 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 4 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 5 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 6 North Havre MT MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2019-01-18   
406-394 7 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 8 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-394 9 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-395 A South Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-395 1 South Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648   2016-08-15   
406-395 4 South Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-395 5 South Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-395 6 South Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-395 8 South Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-396 A Missoula MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-397 A Hingham MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-398 A North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-398 1 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-398 5 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-398 9 North Havre MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-399 A South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-399 0 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-399 1 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-399 2 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2010-09-07   
406-399 3 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-06-04   
406-399 4 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-12-07   
406-399 5 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2010-03-08   
406-399 6 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2011-01-07   
406-399 7 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2011-04-04   
406-399 8 South Havre MT HAVRMTXCDS1  958H TRIANGLE COMMUNICATION SYSTEM, INC. - MT- 648   2017-07-01   
406-399 9 South Havre MT   145J TERRA NOVA TELECOM INC. 648   2025-10-06   
406-400 A Havre MT HAVRMTXCDS1  958H TRIANGLE COMMUNICATION SYSTEM, INC. - MT- 648      
406-400 0 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-07-31   
406-400 1 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-07-31   
406-400 2 Havre MT HAVRMTXCDS1  958H TRIANGLE COMMUNICATION SYSTEM, INC. - MT- 648   2017-06-18   
406-400 3 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-07-31   
406-400 4 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-07-31   
406-400 5 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-07-31   
406-400 6 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-07-31   
406-400 7 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-07-31   
406-400 8 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-07-31   
406-400 9 Havre MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-09-18   
406-401 A Great Falls MT GRFLMTMAX0X  425J CSC WIRELESS, LLC 648      
406-401 0 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-02-04   
406-401 1 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-02-04   
406-401 2 Great Falls MT GRFLMTMAX0X  425J CSC WIRELESS, LLC 648   2019-07-20   
406-401 3 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-02-04   
406-401 4 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-02-04   
406-401 5 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2020-12-23   
406-401 6 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-05   
406-401 7 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-05   
406-401 8 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-05   
406-401 9 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-05   
406-402 A Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648      
406-402 0 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2022-04-02   
406-402 1 Great Falls MT   6529 T-MOBILE USA, INC. 648   2025-08-29   
406-402 2 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2021-07-07   
406-402 3 Great Falls MT GRFLMTMAGMD  5562 METROPCS, INC. 648   2018-06-24   
406-402 4 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2022-09-29   
406-402 5 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2021-04-15   
406-402 6 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2020-02-06   
406-402 7 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2019-04-12   
406-402 8 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2018-10-08   
406-402 9 Great Falls MT GRFLMTMAGMD  6529 T-MOBILE USA, INC. 648   2017-11-15   
406-403 A Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-403 0 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2006-05-08   
406-403 1 Great Falls MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-04-09   
406-403 2 Great Falls MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-07-06   
406-403 3 Great Falls MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-09-14   
406-403 4 Great Falls MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-10-22   
406-403 5 Great Falls MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-10-22   
406-403 6 Great Falls MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-11-23   
406-403 7 Great Falls MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2009-03-22   
406-403 8 Great Falls MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-11-23   
406-403 9 Great Falls MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2010-04-05   
406-404 A Bozeman MT BZMNMTEF2MD  792K CHARTER IP ENABLED SERVICES, LLC 650      
406-404 0 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2014-10-04   
406-404 1 Bozeman MT BZMNMTEF2MD  792K CHARTER IP ENABLED SERVICES, LLC 650   2012-06-01   
406-404 2 Bozeman MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2012-12-17   
406-404 3 Bozeman MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2012-12-17   
406-404 4 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2013-05-10   
406-404 5 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2014-08-05   
406-404 6 Bozeman MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2015-05-14   
406-404 7 Bozeman MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2015-05-14   
406-404 8 Bozeman MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2015-05-14   
406-404 9 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2014-10-22   
406-405 A Libby MT CRALIDXXX7X  453F ONVOY, LLC - MT 960      
406-405 0 Libby MT CRALIDXXGMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 960   2022-12-13   
406-405 1 Libby MT CRALIDXXGMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 960   2023-07-28   
406-405 2 Libby MT CRALIDXXX7X  453F ONVOY, LLC - MT 960   2022-11-06   
406-405 3 Libby MT   624H ONVOY SPECTRUM, LLC 960   2022-11-06   
406-405 4 Libby MT CRALIDXXKMD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 960   2023-05-14   
406-405 5 Libby MT CRALIDXXGMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 960   2023-12-29   
406-405 6 Libby MT CRALIDXXX7X  453F ONVOY, LLC - MT 960   2024-04-14   
406-405 7 Libby MT CRALIDXXX7X  453F ONVOY, LLC - MT 960   2024-09-29   
406-405 8 Libby MT CRALIDXXX7X  453F ONVOY, LLC - MT 960   2023-08-20   

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Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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