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: 559 [Rate centres in NPA 559] [Dial plan for NPA 559]

NXX: 350

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
559-350 A Porterville CA FRSOCAYM7MD  6529 T-MOBILE USA, INC. 728      
559-350 0 Porterville CA   6529 T-MOBILE USA, INC. 728      
559-350 1 Porterville CA   6010 NEW CINGULAR WIRELESS PCS, LLC 728   2015-03-17   
559-350 2 Porterville CA   6529 T-MOBILE USA, INC. 728      
559-350 3 Porterville CA   6529 T-MOBILE USA, INC. 728      
559-350 4 Porterville CA   6010 NEW CINGULAR WIRELESS PCS, LLC 728   2015-03-17   
559-350 5 Porterville CA   6529 T-MOBILE USA, INC. 728   2015-03-18   
559-350 6 Porterville CA   5562 METROPCS, INC. 728   2013-07-15   
559-350 7 Porterville CA   6529 T-MOBILE USA, INC. 728   2015-03-18   
559-350 8 Porterville CA   5562 METROPCS, INC. 728   2014-06-09   
559-350 9 Porterville CA   5562 METROPCS, INC. 728   2014-01-09   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.