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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

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

NXX: 635

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-635 A Terry MT WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-635 0 Terry MT BLNGMT933MD  073H TELNYX LLC 650   2018-07-25   
406-635 1 Terry MT BLNGMT93DS0  588H AIRUS, INC. - MT 650   2021-02-18   
406-635 2 Terry MT   145J TERRA NOVA TELECOM INC. 650   2021-11-04   
406-635 3 Terry MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2021-07-08   
406-635 4 Terry MT WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-635 5 Terry MT WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-635 6 Terry MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2018-12-17   
406-635 7 Terry MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2021-03-07   
406-635 8 Terry MT BLNGMT93DS0  588H AIRUS, INC. - MT 650   2018-03-02   
406-635 9 Terry MT WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.