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: SGNWMIFAX5X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
989-346 A Mio MI 7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 344      
989-484 A Saginaw MI 7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 344      
989-931 A Farwell MI 7279 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 344      

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

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