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: 321

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-321 A Elgin TX AUSWTXGXBMD  6529 T-MOBILE USA, INC. 558      
737-321 0 Elgin TX AUSYTXFC0MD  004F BANDWIDTH.COM CLEC, LLC - TX 558   2023-06-03   
737-321 1 Elgin TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558   2024-04-04   
737-321 2 Elgin TX AUSTTXGREMD  939H COMMIO, LLC 558   2022-08-07   
737-321 3 Elgin TX AUSTTXHOX3X  318C CEBRIDGE TELECOM TX , L.P. - TX 558   2022-09-19   
737-321 4 Elgin TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558   2023-08-12   
737-321 5 Elgin TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558   2023-08-12   
737-321 6 Elgin TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558   2023-08-12   
737-321 7 Elgin TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558   2023-08-12   
737-321 8 Elgin TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558   2023-08-12   
737-321 9 Elgin TX AUSWTXGXBMD  6529 T-MOBILE USA, INC. 558   2022-05-01   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.