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: 235

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
623-235 A Phoenix AZ GLDLAZMADS0  9636 QWEST CORPORATION 666      
623-235 0 Phoenix AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666   2017-05-23   
623-235 1 Phoenix AZ TEMPAZNR5MD  5562 METROPCS, INC. 666   2018-02-26   
623-235 2 Phoenix AZ GLDLAZMADS0  9636 QWEST CORPORATION 666   2016-06-09   
623-235 3 Phoenix AZ GLDLAZMADS0  9636 QWEST CORPORATION 666   2016-07-11   
623-235 4 Phoenix AZ PHNZAZZJAMD  6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2016-07-15   
623-235 5 Phoenix AZ PHNZAZZJAMD  6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2016-07-25   
623-235 6 Phoenix AZ PHNXAZMAX1Z  318J COMCAST IP PHONE, LLC 666   2017-04-19   
623-235 7 Phoenix AZ PHNZAZZJAMD  6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2017-06-21   
623-235 8 Phoenix AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666   2017-08-08   
623-235 9 Phoenix AZ PHNXAZMAX1Z  318J COMCAST IP PHONE, LLC 666   2018-02-19   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.