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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Switch: FDNGUTXCRS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
435-458 A Fielding UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-458 0 Fielding UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-458 1 Fielding UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-458 2 Fielding UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-458 3 Fielding UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-458 4 Fielding UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-458 5 Fielding UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-458 9 Fielding UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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