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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

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

NXX: 473

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-473 A San Gabriel TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558      
737-473 0 San Gabriel TX   073H TELNYX LLC 558   2022-06-06   
737-473 1 San Gabriel TX   903C ONVOY, LLC - TX 558   2021-04-30   
737-473 2 San Gabriel TX   624H ONVOY SPECTRUM, LLC 558   2021-06-27   
737-473 3 San Gabriel TX   903C ONVOY, LLC - TX 558   2021-03-14   
737-473 4 San Gabriel TX   903C ONVOY, LLC - TX 558   2021-03-14   
737-473 6 San Gabriel TX   516J TON80 COMMUNICATIONS, LLC 558   2021-06-17   
737-473 7 San Gabriel TX   624H ONVOY SPECTRUM, LLC 558   2021-12-26   
737-473 8 San Gabriel TX   624H ONVOY SPECTRUM, LLC 558   2021-12-26   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.