Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 858 [Rate centres in NPA 858] [Dial plan for NPA 858]

NXX: 389

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-389 A Chula Vista CA ESCNCAKY2MD  6529 T-MOBILE USA, INC. 732      
858-389 0 Chula Vista CA   649C ONVOY, LLC - CA 732   2024-01-06   
858-389 1 Chula Vista CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2023-12-25   
858-389 2 Chula Vista CA   6529 T-MOBILE USA, INC. 732   2024-01-20   
858-389 3 Chula Vista CA   649C ONVOY, LLC - CA 732   2023-12-18   
858-389 4 Chula Vista CA   649C ONVOY, LLC - CA 732   2023-12-18   
858-389 5 Chula Vista CA   649C ONVOY, LLC - CA 732   2023-12-18   
858-389 6 Chula Vista CA   649C ONVOY, LLC - CA 732   2023-12-18   
858-389 7 Chula Vista CA   6529 T-MOBILE USA, INC. 732   2024-01-20   
858-389 8 Chula Vista CA   6529 T-MOBILE USA, INC. 732   2024-01-20   
858-389 9 Chula Vista CA   6529 T-MOBILE USA, INC. 732   2023-12-14   

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

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