Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

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

NXX: 940

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-940 A Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 0 Tucson AZ TCSMAZOI3MD  5562 METROPCS, INC. 668      
520-940 1 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 2 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 3 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 4 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 5 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 6 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 7 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 8 Tucson AZ TCSMAZOI3MD  6529 T-MOBILE USA, INC. 668      
520-940 9 Tucson AZ TCSMAZOI3MD  5562 METROPCS, INC. 668   2014-09-05   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.