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: 854 [Rate centres in NPA 854] [Dial plan for NPA 854]

NXX: 550

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
854-550 A Lake City SC FLRNSCMAXLY  624H ONVOY SPECTRUM, LLC 432      
854-550 0 Lake City SC   8645 SUNCOM DBA T-MOBILE USA 432   2024-03-24   
854-550 1 Lake City SC   8645 SUNCOM DBA T-MOBILE USA 432   2024-03-24   
854-550 2 Lake City SC   8645 SUNCOM DBA T-MOBILE USA 432   2024-03-24   
854-550 5 Lake City SC   624H ONVOY SPECTRUM, LLC 432   2023-06-26   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.