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: 803 [Rate centres in NPA 803] [Dial plan for NPA 803]

NXX: 477

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
803-477 A Columbia SC CLMASCTLDS1  7421 AT&T - LOCAL 434      
803-477 0 Columbia SC   8645 SUNCOM DBA T-MOBILE USA 434   2007-02-15   
803-477 1 Columbia SC   8645 SUNCOM DBA T-MOBILE USA 434   2006-03-31   
803-477 2 Columbia SC   8645 SUNCOM DBA T-MOBILE USA 434   2007-02-15   
803-477 3 Columbia SC   8534 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - SC 434   2005-08-24   
803-477 4 Columbia SC   8645 SUNCOM DBA T-MOBILE USA 434   2006-03-31   
803-477 5 Columbia SC   8645 SUNCOM DBA T-MOBILE USA 434   2006-03-31   
803-477 6 Columbia SC   8645 SUNCOM DBA T-MOBILE USA 434   2004-02-04   
803-477 7 Columbia SC   8645 SUNCOM DBA T-MOBILE USA 434   2004-02-04   
803-477 8 Columbia SC   8645 SUNCOM DBA T-MOBILE USA 434   2004-02-04   
803-477 9 Columbia SC   7421 AT&T - LOCAL 434      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.