Local Calling Guide

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Irving, TX

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
972-990 7 DLLSTXNODS0  7726 SOUTHWESTERN BELL TELEPHONE COMPANY - TX 552   2017-04-26   
972-990 8 DLLSTXNODS0  7726 SOUTHWESTERN BELL TELEPHONE COMPANY - TX 552   2017-04-26   
972-990 9 DLLSTXNODS0  7726 SOUTHWESTERN BELL TELEPHONE COMPANY - TX 552   2017-04-26   
972-999 A DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-999 0 DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-999 1 DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-999 2 DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-999 3 DLLTTX01DMD  5562 METROPCS, INC. 552   2006-01-13   
972-999 4 DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-999 5 DLLTTX01DMD  5562 METROPCS, INC. 552   2005-09-29   
972-999 6 DLLTTX01DMD  5562 METROPCS, INC. 552   2005-09-29   
972-999 7 DLLTTX01DMD  5562 METROPCS, INC. 552   2005-09-29   
972-999 8 DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-999 9   145J TERRA NOVA TELECOM INC. 552   2024-06-27   

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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