Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 424 [Rate centres in NPA 424] [Dial plan for NPA 424]

NXX: 556

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
424-556 A Santa Monica: Santa Monica DA CA   6529 T-MOBILE USA, INC. 730   2025-08-01   
424-556 0 Santa Monica: Santa Monica DA CA   649C ONVOY, LLC - CA 730   2025-10-19   
424-556 1 Santa Monica: Santa Monica DA CA   649C ONVOY, LLC - CA 730   2025-10-19   
424-556 2 Santa Monica: Santa Monica DA CA   649C ONVOY, LLC - CA 730   2025-10-19   
424-556 3 Santa Monica: Santa Monica DA CA   516C AT&T CORP. 730   2026-01-06   
424-556 8 Santa Monica: Santa Monica DA CA   6529 T-MOBILE USA, INC. 730   2025-08-01   
424-556 9 Santa Monica: Santa Monica DA CA   6529 T-MOBILE USA, INC. 730   2025-08-01   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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