Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 840 [Rate centres in NPA 840] [Dial plan for NPA 840]

NXX: 281

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
840-281 A Colton CA   6529 T-MOBILE USA, INC. 730   2025-10-12   
840-281 8 Colton CA   6529 T-MOBILE USA, INC. 730   2025-11-30   
840-281 9 Colton CA   6529 T-MOBILE USA, INC. 730   2025-10-12   

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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