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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OCN: 321J HD CARRIER LLC

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

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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