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: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

NXX: 304

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-304 A Bartlett IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-304 0 Bartlett IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-304 1 Bartlett IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-304 2 Bartlett IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-304 3 Bartlett IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-304 4 Bartlett IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-304 5 Bartlett IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-304 6 Bartlett IL CHCGILWUDS4  063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358      
331-304 7 Bartlett IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-304 8 Bartlett IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-304 9 Bartlett IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.