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: 307 [Rate centres in NPA 307] [Dial plan for NPA 307]

NXX: 990

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-990 A Lander WY CHYNWYJL4MD  939H COMMIO, LLC 654      
307-990 0 Lander WY CHYNWYJL4MD  939H COMMIO, LLC 654   2023-06-04   
307-990 1 Lander WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2023-07-23   
307-990 2 Lander WY CHYNWYJL4MD  939H COMMIO, LLC 654   2023-12-23   
307-990 3 Lander WY CHYNWYJL4MD  939H COMMIO, LLC 654   2023-12-23   
307-990 4 Lander WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2024-03-07   
307-990 5 Lander WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2024-07-08   
307-990 8 Lander WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2023-10-28   
307-990 9 Lander WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2023-10-28   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.