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: 972 [Rate centres in NPA 972] [Dial plan for NPA 972]

NXX: 330

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
972-330 A Ennis TX DLLSTXALDS4  903C ONVOY, LLC - TX 552      
972-330 1 Ennis TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2018-09-28   
972-330 2 Ennis TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2011-08-27   
972-330 3 Ennis TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2010-09-11   
972-330 4 Ennis TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2005-03-21   
972-330 5 Ennis TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2009-03-20   
972-330 6 Ennis TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2010-09-11   
972-330 7 Ennis TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2009-11-30   
972-330 8 Ennis TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2004-03-11   
972-330 9 Ennis TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2009-11-30   

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.