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.

White Sulphur Springs, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-305 A BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-305 0 BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-305 1 BLNGMTWE6MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650      
406-547 A WSSPMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-547 0 WSSPMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-547 2 WSSPMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-547 3 WSSPMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-547 4 BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-547 6 WSSPMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 650      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.