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: 870 [Rate centres in NPA 870] [Dial plan for NPA 870]

NXX: 785

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
870-785 A Oil Trough AR   128L E. RITTER COMMUNICATIONS, LLC 528      
870-785 0 Oil Trough AR   128L E. RITTER COMMUNICATIONS, LLC 528   2023-03-27   
870-785 1 Oil Trough AR LTRKARFRX7Y  073H TELNYX LLC 528   2023-04-03   
870-785 5 Oil Trough AR LTRKARFRXLY  348F ONVOY, LLC - AR 528   2021-07-03   
870-785 7 Oil Trough AR NLRKAR446MD  6529 T-MOBILE USA, INC. 528   2025-04-11   
870-785 8 Oil Trough AR LTRKARFRXLY  348F ONVOY, LLC - AR 528   2020-03-13   
870-785 9 Oil Trough AR JNBOARMAX1X  624H ONVOY SPECTRUM, LLC 528   2025-01-07   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.