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
406-397 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 GRFLMTMAGMD  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      

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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