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: 970 [Rate centres in NPA 970] [Dial plan for NPA 970]

NXX: 637

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
970-637 A Durango CO DNVRCOII0MD  6529 T-MOBILE USA, INC. 656      
970-637 0 Durango CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2024-10-10   
970-637 1 Durango CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2024-11-27   
970-637 2 Durango CO   6529 T-MOBILE USA, INC. 656   2025-11-10   
970-637 4 Durango CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2025-08-10   
970-637 5 Durango CO   6529 T-MOBILE USA, INC. 656   2025-07-27   
970-637 6 Durango CO   6529 T-MOBILE USA, INC. 656   2025-09-18   
970-637 7 Durango CO   6529 T-MOBILE USA, INC. 656   2024-10-11   
970-637 8 Durango CO   6529 T-MOBILE USA, INC. 656   2024-10-11   
970-637 9 Durango CO   6529 T-MOBILE USA, INC. 656   2024-07-26   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.