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: 938

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-938 A Alzada MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-938 0 Alzada MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-938 3 Alzada MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2018-12-17   
406-938 4 Alzada MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-938 7 Alzada MT   6010 NEW CINGULAR WIRELESS PCS, LLC 650   2021-08-27   
406-938 8 Alzada MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-938 9 Alzada MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.