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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NPA: 737 [Rate centres in NPA 737] [Dial plan for NPA 737]

NXX: 425

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-425 A Georgetown TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2025-10-24   
737-425 0 Georgetown TX   903C ONVOY, LLC - TX 558   2025-10-27   
737-425 9 Georgetown TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2025-10-24   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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