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: DKLBILRSDMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
779-245 A Sterling IL 6529 T-MOBILE USA, INC. 364      
779-250 A Sterling IL 6529 T-MOBILE USA, INC. 364      
779-809 A Fulton IL 5562 METROPCS, INC. 364      
815-501 A De Kalb IL 5562 METROPCS, INC. 364      
815-590 A Sterling IL 6529 T-MOBILE USA, INC. 364      
815-593 A De Kalb IL 6529 T-MOBILE USA, INC. 364      
815-716 A Sterling IL 5562 METROPCS, INC. 364      
815-739 A Sycamore IL 5562 METROPCS, INC. 364      
815-793 A De Kalb IL 6529 T-MOBILE USA, INC. 364      
815-909 A De Kalb IL 6529 T-MOBILE USA, INC. 364      
815-970 A Sycamore IL 5562 METROPCS, INC. 364      
815-994 A Dixon IL 5562 METROPCS, INC. 364      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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