Local Calling Guide

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NPA: 520 [Rate centres in NPA 520] [Dial plan for NPA 520]

NXX: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-257 A Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-257 0 Tucson AZ TCSMAZCH1MD  6010 NEW CINGULAR WIRELESS PCS, LLC 668   2014-10-25   
520-257 1 Tucson AZ TCSNAZXGDS0  7465 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 668   2014-10-21   
520-257 2 Tucson AZ TCSNAZMAVMD  3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668   2014-10-21   
520-257 3 Tucson AZ TCSNAZMAVMD  3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668   2014-10-21   
520-257 4 Tucson AZ TCSNAZMAVMD  3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668   2014-10-21   
520-257 5 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668   2014-10-18   
520-257 6 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668   2014-10-18   
520-257 7 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668   2014-10-18   
520-257 8 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668   2014-10-18   
520-257 9 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668   2014-10-18   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

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