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: 858 [Rate centres in NPA 858] [Dial plan for NPA 858]

NXX: 341

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-341 A Chula Vista CA ESCNCAKY2MD  6529 T-MOBILE USA, INC. 732      
858-341 0 Chula Vista CA   073H TELNYX LLC 732   2022-12-31   
858-341 1 Chula Vista CA   073H TELNYX LLC 732   2023-05-22   
858-341 2 Chula Vista CA   073H TELNYX LLC 732   2023-05-22   
858-341 3 Chula Vista CA   073H TELNYX LLC 732   2023-05-22   
858-341 4 Chula Vista CA   649C ONVOY, LLC - CA 732   2023-06-11   
858-341 5 Chula Vista CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2024-04-02   
858-341 6 Chula Vista CA   490J DISH WIRELESS, LLC 732   2023-11-27   
858-341 7 Chula Vista CA   649C ONVOY, LLC - CA 732   2023-04-30   
858-341 8 Chula Vista CA   6529 T-MOBILE USA, INC. 732   2022-12-30   
858-341 9 Chula Vista CA   6529 T-MOBILE USA, INC. 732   2022-12-30   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.