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: 603 [Rate centres in NPA 603] [Dial plan for NPA 603]

NXX: 258

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-258 A Hollis NH MNCHNHCOCM1  5562 METROPCS, INC. 122      
603-258 0 Hollis NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2020-02-15   
603-258 1 Hollis NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2023-07-02   
603-258 5 Hollis NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2026-01-22   
603-258 7 Hollis NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2026-01-30   
603-258 8 Hollis NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2023-09-08   
603-258 9 Hollis NH   5562 METROPCS, INC. 122   2017-06-05   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.