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: 840 [Rate centres in NPA 840] [Dial plan for NPA 840]

NXX: 241

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
840-241 A Rialto CA LSANCARCD3S  649C ONVOY, LLC - CA 730      
840-241 0 Rialto CA LSANCAJW7MD  939H COMMIO, LLC 730   2024-01-28   
840-241 1 Rialto CA LSANCAJW7MD  939H COMMIO, LLC 730   2024-01-28   
840-241 2 Rialto CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2023-11-01   
840-241 4 Rialto CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2024-12-10   
840-241 5 Rialto CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2023-12-15   
840-241 6 Rialto CA LSANCA03GMD  624H ONVOY SPECTRUM, LLC 730   2025-01-23   
840-241 8 Rialto CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2023-11-09   
840-241 9 Rialto CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2023-11-09   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.