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: 821

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
972-821 A Irving TX DLLTTX01DMD  5562 METROPCS, INC. 552      
972-821 0 Irving TX   5562 METROPCS, INC. 552   2019-07-12   
972-821 1 Irving TX   5562 METROPCS, INC. 552   2005-05-20   
972-821 2 Irving TX   5562 METROPCS, INC. 552   2005-05-20   
972-821 3 Irving TX   5562 METROPCS, INC. 552   2006-01-13   
972-821 4 Irving TX   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2004-12-17   
972-821 5 Irving TX   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2004-12-17   
972-821 6 Irving TX   5562 METROPCS, INC. 552   2005-02-18   
972-821 7 Irving TX   5562 METROPCS, INC. 552   2005-02-18   
972-821 8 Irving TX   5562 METROPCS, INC. 552   2005-02-18   
972-821 9 Irving TX   5562 METROPCS, INC. 552   2005-02-18   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.