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: 221

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-221 A Cheyenne WY CHYNWY07GMD  6529 T-MOBILE USA, INC. 654      
307-221 0 Cheyenne WY CHYNWY07GMD  6529 T-MOBILE USA, INC. 654      
307-221 1 Cheyenne WY CHYNWY07GMD  6529 T-MOBILE USA, INC. 654      
307-221 2 Cheyenne WY CHYNWY07GMD  6529 T-MOBILE USA, INC. 654      
307-221 3 Cheyenne WY CHYNWY07GMD  6529 T-MOBILE USA, INC. 654      
307-221 4 Cheyenne WY CHYNWY07LMD  5562 METROPCS, INC. 654      
307-221 5 Cheyenne WY CHYNWY07GMD  6529 T-MOBILE USA, INC. 654      
307-221 6 Cheyenne WY CHYNWY07GMD  6529 T-MOBILE USA, INC. 654      
307-221 7 Cheyenne WY CHYNWY07LMD  5562 METROPCS, INC. 654      
307-221 8 Cheyenne WY CHYNWYRF6MD  145J TERRA NOVA TELECOM INC. 654   2023-11-11   
307-221 9 Cheyenne WY CHYNWY07GMD  6529 T-MOBILE USA, INC. 654      

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.