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: 203

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-203 A Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 0 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 1 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 2 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 3 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 4 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 5 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 6 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 7 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 8 Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-203 9 Aurora IL CHCGILIDXDX  624H ONVOY SPECTRUM, LLC 358      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.