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: TRMTILXDRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
309-925 A Tremont IL 1015 FRONTIER NORTH, INC. - IL 368      
309-925 2 Tremont IL 1015 FRONTIER NORTH, INC. - IL 368      
309-925 3 Tremont IL 1015 FRONTIER NORTH, INC. - IL 368      
309-925 4 Tremont IL 1015 FRONTIER NORTH, INC. - IL 368      
309-925 5 Tremont IL 1015 FRONTIER NORTH, INC. - IL 368      
309-925 7 Tremont IL 1015 FRONTIER NORTH, INC. - IL 368      
309-925 9 Tremont IL 1015 FRONTIER NORTH, INC. - IL 368      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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