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: 636 [Rate centres in NPA 636] [Dial plan for NPA 636]

NXX: 439

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-439 A O'Fallon MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520      
636-439 0 O'Fallon MO WNVLMOXAVMD  6529 T-MOBILE USA, INC. 520   2011-03-16   
636-439 1 O'Fallon MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2012-07-20   
636-439 2 O'Fallon MO STLSMOPLDS4  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 520   2011-03-16   
636-439 3 O'Fallon MO WNVLMOXAVMD  6529 T-MOBILE USA, INC. 520   2011-07-18   
636-439 4 O'Fallon MO WNVLMOXAVMD  6529 T-MOBILE USA, INC. 520   2013-09-30   
636-439 5 O'Fallon MO STLSMOPLDS4  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 520   2012-03-22   
636-439 6 O'Fallon MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2012-10-31   
636-439 7 O'Fallon MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2012-10-31   
636-439 8 O'Fallon MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2012-10-31   
636-439 9 O'Fallon MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2011-03-13   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.