Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Switch: TCSNAZMAXAY

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
520-476 A Tucson AZ 478J NUSO, LLC 668      
520-476 1 Tucson AZ 478J NUSO, LLC 668   2020-10-25   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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