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: 630 [Rate centres in NPA 630] [Dial plan for NPA 630]

NXX: 431

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
630-431 A Schaumburg IL SCBGILRRGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
630-431 0 Schaumburg IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2024-06-14   
630-431 1 Schaumburg IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2024-06-14   
630-431 8 Schaumburg IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2024-06-14   
630-431 9 Schaumburg IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2024-06-14   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.