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.

Switch: SGNWMIACFMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
989-357 A Bay City MI 321J HD CARRIER LLC 344      
989-357 5 Bay City MI 321J HD CARRIER LLC 344   2026-05-21   
989-357 6 Bay City MI 321J HD CARRIER LLC 344   2026-05-21   
989-357 9 Bay City MI 321J HD CARRIER LLC 344   2020-11-21   
989-554 3 Midland MI 321J HD CARRIER LLC 344   2026-03-08   
989-554 6 Midland MI 321J HD CARRIER LLC 344   2026-03-08   
989-554 7 Midland MI 321J HD CARRIER LLC 344   2026-03-08   
989-899 4 Saginaw MI 321J HD CARRIER LLC 344   2026-02-14   
989-899 5 Saginaw MI 321J HD CARRIER LLC 344   2026-02-14   
989-899 6 Saginaw MI 321J HD CARRIER LLC 344   2026-02-14   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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