Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 603 [Rate centres in NPA 603] [Dial plan for NPA 603]

NXX: 850

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-850 A Lisbon NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-850 3 Lisbon NH   637E ONVOY, LLC - NH 122   2025-02-02   
603-850 8 Lisbon NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2023-08-31   
603-850 9 Lisbon NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2021-11-04   

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

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