Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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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
406-998 5 Billings MT BLNGMT93DS0  588H AIRUS, INC. - MT 650   2020-03-27   
406-998 6 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2020-01-05   
406-998 7 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2019-09-06   
406-998 8 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2016-02-05   
406-998 9 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2015-12-04   
406-999 A Big Sky MT BZMNMTHZDS0  746D MONTANA OPTICOM, LLC - MT 650      

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Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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