Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
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Circle, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-485 A WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-485 1 WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-485 2 WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-485 3 WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-485 5 BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2018-12-17   
406-485 7 WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-485 8   145J TERRA NOVA TELECOM INC. 650   2025-06-07   
406-485 9 WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-974 A BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-974 0 BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-974 2 BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-974 3 BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-974 4 BLNGMT939MD  145J TERRA NOVA TELECOM INC. 650   2026-01-04   
406-974 6 BLNGMTWE6MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2019-10-10   
406-974 9 BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      

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

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