Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Switch: RYCYTXNERS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
972-635 A Royse City TX 9533 SOUTHWESTERN BELL 552      
972-636 A Royse City EMS TX 9533 SOUTHWESTERN BELL 552      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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