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: 506

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-506 A Tombstone AZ TCSNAZMAXHX  630E ONVOY, LLC - AZ 668      
520-506 0 Tombstone AZ   939H COMMIO, LLC 668   2021-06-11   
520-506 1 Tombstone AZ   630E ONVOY, LLC - AZ 668   2021-02-20   
520-506 2 Tombstone AZ   630E ONVOY, LLC - AZ 668   2021-02-20   
520-506 3 Tombstone AZ   630E ONVOY, LLC - AZ 668   2021-02-20   
520-506 4 Tombstone AZ   630E ONVOY, LLC - AZ 668   2021-02-20   
520-506 5 Tombstone AZ   630E ONVOY, LLC - AZ 668   2021-02-20   
520-506 6 Tombstone AZ   6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 668   2021-02-24   
520-506 7 Tombstone AZ   073H TELNYX LLC 668   2022-08-29   
520-506 8 Tombstone AZ   939H COMMIO, LLC 668   2021-06-11   
520-506 9 Tombstone AZ   939H COMMIO, LLC 668   2021-06-11   

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

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