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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Portal, AZ

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
520-558 A PERCAZXCDS0  2176 VALLEY TEL COOP INC 668      
520-587 A TCSMAZCH1MD  6010 NEW CINGULAR WIRELESS PCS, LLC 668      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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