Local Calling Guide

Area code/prefix search

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

NXX: 228

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
972-228 A Dallas TX DLLSTXDNDS0  9533 SOUTHWESTERN BELL 552      

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

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