Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Switch: DLLSTX97XCX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
972-688 A Plano TX 321J HD CARRIER LLC 552      
972-688 8 Plano TX 321J HD CARRIER LLC 552   2021-12-26   
972-688 9 Plano TX 321J HD CARRIER LLC 552   2021-12-26   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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