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: 220

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-220 A Sierra Vista AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-220 0 Sierra Vista AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-220 1 Sierra Vista AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-220 2 Sierra Vista AZ TCSMAZCH1MD  6010 NEW CINGULAR WIRELESS PCS, LLC 668   2007-09-24   
520-220 3 Sierra Vista AZ TCSNAZXGAMD  6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 668   2023-11-13   
520-220 4 Sierra Vista AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668   2022-10-29   
520-220 5 Sierra Vista AZ TCSNAZMAXHX  630E ONVOY, LLC - AZ 668   2007-06-04   
520-220 6 Sierra Vista AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-220 7 Sierra Vista AZ TCSMAZCH1MD  6010 NEW CINGULAR WIRELESS PCS, LLC 668   2008-01-09   
520-220 8 Sierra Vista AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-220 9 Sierra Vista AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      

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

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