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.

Switch: WSLCTXXAPS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-347 5 Lyford TX 4344 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 568      
956-636 1 Santa Rosa TX 4344 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 568      
956-689 1 Raymondville TX 4344 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 568      
956-797 8 La Feria TX 4344 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 568      
956-849 5 Roma TX 4344 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 568      
956-973 A Weslaco TX 4344 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 568      
956-973 6 Weslaco TX 4344 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 568      

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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