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: BLNGMTMAXMD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-901 6 Billings MT 6529 T-MOBILE USA, INC. 650   2021-11-17   
406-901 7 Billings MT 6529 T-MOBILE USA, INC. 650   2021-11-17   
406-901 8 Billings MT 6529 T-MOBILE USA, INC. 650   2021-11-17   
406-920 5 Bozeman MT 6529 T-MOBILE USA, INC. 650   2021-04-15   
406-920 9 Bozeman MT 6529 T-MOBILE USA, INC. 650   2020-12-14   
406-922 7 Bozeman MT 6529 T-MOBILE USA, INC. 650   2022-02-25   
406-936 7 Clyde Park MT 6529 T-MOBILE USA, INC. 650   2024-03-15   
406-969 7 Billings MT 6529 T-MOBILE USA, INC. 650   2024-03-23   
406-970 4 Billings MT 6529 T-MOBILE USA, INC. 650   2021-08-22   
406-970 5 Billings MT 6529 T-MOBILE USA, INC. 650   2021-08-22   
406-970 6 Billings MT 6529 T-MOBILE USA, INC. 650   2021-08-22   
406-970 8 Billings MT 6529 T-MOBILE USA, INC. 650   2021-06-11   
406-970 9 Billings MT 6529 T-MOBILE USA, INC. 650   2021-06-11   
406-993 0 Big Sky MT 6529 T-MOBILE USA, INC. 650   2024-07-24   

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Last updated: Sat, 04 Jul 2026 13:07:56 UTC

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