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.
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Switch: SNANTX78G00

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-977 9 Laredo TX 6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2019-10-24   
956-999 5 Laredo TX 6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2013-07-27   
956-999 6 Laredo TX 6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2013-07-27   

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

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