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: 240

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
840-240 A Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730      
840-240 0 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-10-30   
840-240 1 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-01-23   
840-240 2 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-01-23   
840-240 3 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-01-23   
840-240 4 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-01-23   
840-240 5 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-03-02   
840-240 6 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-03-02   
840-240 7 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-03-02   
840-240 8 Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-03-02   
840-240 9 Diamond Bar CA RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2023-09-22   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.