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: 657 [Rate centres in NPA 657] [Dial plan for NPA 657]

NXX: 610

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-610 A Santa Ana CA LSANCAJWRMD  026K BARR TELL USA, LLC 730      
657-610 0 Santa Ana CA   6529 T-MOBILE USA, INC. 730   2022-09-28   
657-610 1 Santa Ana CA   026K BARR TELL USA, LLC 730   2022-07-31   
657-610 2 Santa Ana CA   6529 T-MOBILE USA, INC. 730   2023-07-15   
657-610 3 Santa Ana CA   6529 T-MOBILE USA, INC. 730   2023-07-15   
657-610 4 Santa Ana CA   6529 T-MOBILE USA, INC. 730   2022-08-19   
657-610 5 Santa Ana CA   6529 T-MOBILE USA, INC. 730   2022-08-19   
657-610 6 Santa Ana CA   6529 T-MOBILE USA, INC. 730   2022-08-19   
657-610 7 Santa Ana CA   6529 T-MOBILE USA, INC. 730   2022-08-19   
657-610 8 Santa Ana CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2022-08-01   
657-610 9 Santa Ana CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2022-08-01   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.