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: 203 [Rate centres in NPA 203] [Dial plan for NPA 203]

NXX: 308

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-308 A Ansonia-Derby CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920      
203-308 0 Ansonia-Derby CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2008-12-28   
203-308 1 Ansonia-Derby CT   6624 OMNIPOINT COMMUNICATIONS, INC. - CT DBA T-MOBILE USA 920   2009-04-11   
203-308 2 Ansonia-Derby CT   318J COMCAST IP PHONE LLC 920   2010-08-08   
203-308 3 Ansonia-Derby CT   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2009-07-28   
203-308 4 Ansonia-Derby CT   3083 PAETEC COMMUNICATIONS, LLC - CT 920   2009-10-29   
203-308 5 Ansonia-Derby CT   199F BANDWIDTH.COM CLEC, LLC - CT 920   2010-09-09   
203-308 6 Ansonia-Derby CT   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2010-09-09   
203-308 7 Ansonia-Derby CT   6624 OMNIPOINT COMMUNICATIONS, INC. - CT DBA T-MOBILE USA 920   2010-08-07   
203-308 8 Ansonia-Derby CT   6624 OMNIPOINT COMMUNICATIONS, INC. - CT DBA T-MOBILE USA 920   2010-04-01   
203-308 9 Ansonia-Derby CT   6624 OMNIPOINT COMMUNICATIONS, INC. - CT DBA T-MOBILE USA 920   2010-01-21   

Last updated: Fri, 01 Jul 2022 02:53:40 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.