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
406-390 4 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-390 5 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-390 6 South Havre MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-391 A Cut Bank MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-391 0 Cut Bank MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648   2026-01-17   
406-391 1 Cut Bank MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-10-31   
406-391 2 Cut Bank MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2023-04-02   
406-391 4 Cut Bank MT   145J TERRA NOVA TELECOM INC. 648   2025-10-09   
406-391 6 Cut Bank MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2024-04-28   
406-391 7 Cut Bank MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-03-28   
406-391 9 Cut Bank MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2026-03-04   
406-392 A North Wolf Point MT NWPNMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-392 5 North Wolf Point MT NWPNMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-392 7 North Wolf Point MT GLSGMTXC1MD  443B SAGEBRUSH CELLULAR, INC. 650      
406-393 A Somers MT KLSLMTAZ1MD  792K CHARTER IP ENABLED SERVICES, LLC 648      
406-393 0 Somers MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-14   
406-393 1 Somers MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-14   
406-393 2 Somers MT KLSLMTAZ1MD  792K CHARTER IP ENABLED SERVICES, LLC 648   2006-05-21   
406-393 3 Somers MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-14   
406-393 4 Somers MT MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2021-01-21   
406-393 5 Somers MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-05   
406-393 6 Somers MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-03-07   
406-393 7 Somers MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2007-11-17   
406-393 8 Somers MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2011-03-05   
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      

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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