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: 413

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-413 A Smithville TX   6529 T-MOBILE USA, INC. 558   2025-03-27   
737-413 0 Smithville TX   515J IP HORIZON LLC 558   2025-04-27   
737-413 1 Smithville TX   515J IP HORIZON LLC 558   2025-04-27   
737-413 9 Smithville TX   6529 T-MOBILE USA, INC. 558   2025-03-27   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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