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: 925 [Rate centres in NPA 925] [Dial plan for NPA 925]

NXX: 570

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
925-570 A Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      
925-570 0 Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      
925-570 1 Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      
925-570 2 Dublin-San Ramon CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2021-07-30   
925-570 3 Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      
925-570 4 Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      
925-570 5 Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      
925-570 6 Dublin-San Ramon CA OKLECAZV1MD  5562 METROPCS, INC. 722      
925-570 7 Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      
925-570 8 Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      
925-570 9 Dublin-San Ramon CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.