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: 983

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-983 A Lockhart TX AUSUTXNIGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2024-12-27   
737-983 0 Lockhart TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558   2024-12-28   
737-983 1 Lockhart TX   6529 T-MOBILE USA, INC. 558   2025-02-27   
737-983 2 Lockhart TX   6529 T-MOBILE USA, INC. 558   2025-02-27   
737-983 3 Lockhart TX   903C ONVOY, LLC - TX 558   2025-10-20   
737-983 4 Lockhart TX   6506 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 558   2025-02-12   
737-983 5 Lockhart TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2025-09-06   
737-983 6 Lockhart TX   903C ONVOY, LLC - TX 558   2025-11-28   
737-983 7 Lockhart TX   515J IP HORIZON LLC 558   2025-04-27   
737-983 8 Lockhart TX   515J IP HORIZON LLC 558   2025-04-27   
737-983 9 Lockhart TX AUSUTXNIGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2024-12-27   

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.