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: 593

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-593 A Butte MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-593 0 Butte MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-593 1 Butte MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-593 3 Butte MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2024-04-06   
406-593 4 Butte MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648   2025-02-10   
406-593 6 Butte MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648   2025-02-10   
406-593 7 Butte MT HLNAMTMAWMD  6529 T-MOBILE USA, INC. 648   2024-10-24   
406-593 8 Butte MT HLNAMTMAWMD  6529 T-MOBILE USA, INC. 648   2024-12-26   
406-593 9 Butte MT   6529 T-MOBILE USA, INC. 648   2025-01-17   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.