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: 623 [Rate centres in NPA 623] [Dial plan for NPA 623]

NXX: 313

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
623-313 A Phoenix AZ PHNXAZMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 666      
623-313 0 Phoenix AZ PHNXAZMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 666   2006-05-28   
623-313 1 Phoenix AZ PHNXAZMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 666   2006-06-12   
623-313 2 Phoenix AZ PHNXAZMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 666   2006-06-12   
623-313 3 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2006-08-19   
623-313 4 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2006-08-19   
623-313 5 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2006-08-19   
623-313 6 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2006-08-19   
623-313 7 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2006-08-19   
623-313 8 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2006-08-19   
623-313 9 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666   2006-08-11   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.