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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St Regis, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-269 A MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-269 0   6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-280 A MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-280 0   6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-649 A ALTNMTXBRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-649 0   145J TERRA NOVA TELECOM INC. 648   2025-10-11   
406-649 2   2235 BLACKFOOT TEL. COOP., INC. 648      
406-649 7   2235 BLACKFOOT TEL. COOP., INC. 648      
406-649 9   2235 BLACKFOOT TEL. COOP., INC. 648      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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