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: 252

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
840-252 A Mentone CA RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730      
840-252 0 Mentone CA LSANCARC32Z  073H TELNYX LLC 730   2022-05-12   
840-252 1 Mentone CA ONTRCAXPXPY  649C ONVOY, LLC - CA 730   2023-08-10   
840-252 2 Mentone CA ONTRCAXPXPY  649C ONVOY, LLC - CA 730   2024-03-09   
840-252 3 Mentone CA ONTRCAXPXPY  649C ONVOY, LLC - CA 730   2023-08-10   
840-252 4 Mentone CA ONTRCAXPXPY  649C ONVOY, LLC - CA 730   2023-08-10   
840-252 5 Mentone CA ONTRCAXPXPY  649C ONVOY, LLC - CA 730   2023-08-10   
840-252 6 Mentone CA ONTRCAXPXPY  649C ONVOY, LLC - CA 730   2023-08-10   
840-252 7 Mentone CA RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2023-01-09   
840-252 8 Mentone CA RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2022-10-31   
840-252 9 Mentone CA RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2022-04-30   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.