Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 520 [Rate centres in NPA 520] [Dial plan for NPA 520]

NXX: 399

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-399 A Tucson AZ GNVYAZMADS0  9636 QWEST CORPORATION 668      
520-399 0 Tucson AZ GNVYAZMADS0  9636 QWEST CORPORATION 668      
520-399 1 Tucson AZ GNVYAZMADS0  9636 QWEST CORPORATION 668      
520-399 2 Tucson AZ GNVYAZMADS0  9636 QWEST CORPORATION 668      
520-399 3 Tucson AZ GNVYAZMADS0  9636 QWEST CORPORATION 668      
520-399 4 Tucson AZ GNVYAZMADS0  9636 QWEST CORPORATION 668      
520-399 5 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668   2005-03-26   
520-399 6 Tucson AZ TCSNAZMAVMD  3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668   2005-04-29   
520-399 7 Tucson AZ TCSNAZMAVMD  3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668   2006-08-28   
520-399 8 Tucson AZ TCSNAZMAVMD  3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668   2005-04-29   
520-399 9 Tucson AZ GNVYAZMADS0  9636 QWEST CORPORATION 668      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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