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: 643

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-643 A Aurora IL ELGNILOTGT5  5562 METROPCS, INC. 358      
331-643 0 Aurora IL ELGNILOTGT5  5562 METROPCS, INC. 358   2007-11-02   
331-643 1 Aurora IL ELGNILOTGT5  5562 METROPCS, INC. 358   2007-11-02   
331-643 2 Aurora IL ELGNILOTGT5  5562 METROPCS, INC. 358   2007-11-02   
331-643 3 Aurora IL ELGNILOTGT5  5562 METROPCS, INC. 358   2007-11-02   
331-643 4 Aurora IL EGVGILIFDS1  7196 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 358   2008-11-05   
331-643 5 Aurora IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2009-02-19   
331-643 6 Aurora IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2009-10-22   
331-643 7 Aurora IL ELGNILOTGT5  5562 METROPCS, INC. 358   2010-05-28   
331-643 8 Aurora IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2010-05-28   
331-643 9 Aurora IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2007-11-02   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.