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: 0720 ACE TEL. CO. OF MICHIGAN, INC.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
231-223 A Old Mission MI OLMSMIXIRS0  348      
231-223 0 Old Mission MI OLMSMIXIRS0  348      
231-223 1 Old Mission MI OLMSMIXIRS0  348      
231-223 2 Old Mission MI OLMSMIXIRS0  348      
231-223 3 Old Mission MI OLMSMIXIRS0  348      
231-223 4 Old Mission MI OLMSMIXIRS0  348      
231-223 7 Old Mission MI OLMSMIXIRS0  348      
231-223 8 Old Mission MI OLMSMIXIRS0  348      
231-223 9 Old Mission MI OLMSMIXIRS0  348      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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