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: 815 [Rate centres in NPA 815] [Dial plan for NPA 815]

NXX: 999

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
815-999 A Joliet IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
815-999 0 Joliet IL   6529 T-MOBILE USA, INC. 358   2004-04-04   
815-999 1 Joliet IL   5562 METROPCS, INC. 358   2011-08-04   
815-999 2 Joliet IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2005-07-17   
815-999 3 Joliet IL   460K FIRST COMMUNICATIONS, LLC 358   2010-05-11   
815-999 4 Joliet IL   460K FIRST COMMUNICATIONS, LLC 358   2010-05-11   
815-999 5 Joliet IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-03-15   
815-999 6 Joliet IL   5562 METROPCS, INC. 358   2014-07-21   
815-999 7 Joliet IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2010-11-19   
815-999 8 Joliet IL   6529 T-MOBILE USA, INC. 358   2004-04-04   
815-999 9 Joliet IL   6529 T-MOBILE USA, INC. 358   2004-04-04   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.