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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Switch: LMBRMTXCRS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-774 A Lambert MT 2246 MID-RIVERS TEL. COOP., INC. 650      
406-774 3 Lambert MT 2246 MID-RIVERS TEL. COOP., INC. 650      
406-774 7 Lambert MT 2246 MID-RIVERS TEL. COOP., INC. 650      
406-774 9 Lambert MT 2246 MID-RIVERS TEL. COOP., INC. 650      

Last updated: Wed, 28 Sep 2022 23:50:19 UTC

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