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: 243

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-243 A Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 0 Lombard IL BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
331-243 1 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 2 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 3 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 4 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 5 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 6 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 7 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 8 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-243 9 Lombard IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.