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: 940

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
972-940 A Dallas TX DLLSTXNODS0  9533 SOUTHWESTERN BELL 552      
972-940 0 Dallas TX   5562 METROPCS, INC. 552   2017-04-07   
972-940 1 Dallas TX   5562 METROPCS, INC. 552   2017-04-07   
972-940 2 Dallas TX   5562 METROPCS, INC. 552   2017-04-07   
972-940 3 Dallas TX   5562 METROPCS, INC. 552   2017-07-25   
972-940 4 Dallas TX   5562 METROPCS, INC. 552   2017-04-07   
972-940 5 Dallas TX   5562 METROPCS, INC. 552   2017-07-25   
972-940 6 Dallas TX   9533 SOUTHWESTERN BELL 552   2017-02-23   
972-940 7 Dallas TX   9533 SOUTHWESTERN BELL 552   2017-02-23   
972-940 8 Dallas TX   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552   2017-09-08   
972-940 9 Dallas TX   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552   2017-09-08   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.