Local Calling Guide

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

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-952 6 Salem NH   4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2012-10-05   
603-952 7 Salem NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2014-06-19   
603-952 8 Salem NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2014-10-16   
603-952 9 Salem NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2013-12-05   
603-953 A Dover NH   829J PAETEC ITEL, LLC 122   2025-04-30   
603-953 0 Dover NH   829J PAETEC ITEL, LLC 122      
603-953 1 Dover NH   829J PAETEC ITEL, LLC 122      
603-953 2 Dover NH   829J PAETEC ITEL, LLC 122      
603-953 3 Dover NH   6386 BELL ATLANTIC MOBILE, INC 122   2004-12-03   
603-953 4 Dover NH   6386 BELL ATLANTIC MOBILE, INC 122   2005-11-22   
603-953 5 Dover NH   6386 BELL ATLANTIC MOBILE, INC 122   2006-11-02   
603-953 6 Dover NH   6386 BELL ATLANTIC MOBILE, INC 122   2007-09-01   
603-953 7 Dover NH   6889 OMNIPOINT MIAMI E LICENSE, LLC 122   2008-02-03   
603-953 8 Dover NH   6386 BELL ATLANTIC MOBILE, INC 122   2008-04-14   
603-953 9 Dover NH   829J PAETEC ITEL, LLC 122      
603-956 A Portsmouth NH MNCHNHCO18Z  197D VONAGE AMERICA LLC 122      
603-956 0 Portsmouth NH   939H COMMIO, LLC 122   2022-11-24   
603-956 1 Portsmouth NH   073H TELNYX LLC 122   2022-12-15   
603-956 2 Portsmouth NH   197D VONAGE AMERICA LLC 122   2022-09-23   
603-956 3 Portsmouth NH   637E ONVOY, LLC - NH 122   2022-09-29   
603-956 4 Portsmouth NH   637E ONVOY, LLC - NH 122   2022-09-29   
603-956 5 Portsmouth NH   637E ONVOY, LLC - NH 122   2022-12-23   
603-956 6 Portsmouth NH   637E ONVOY, LLC - NH 122   2023-08-20   
603-956 7 Portsmouth NH   637E ONVOY, LLC - NH 122   2023-05-08   
603-956 8 Portsmouth NH   8299 TELEPORT COMMUNICATIONS AMERICA, LLC - NH 122   2024-01-02   
603-956 9 Portsmouth NH   637E ONVOY, LLC - NH 122   2023-06-23   
603-957 A Portsmouth NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-957 0 Portsmouth NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-957 1 Portsmouth NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-957 2 Portsmouth NH   6386 BELL ATLANTIC MOBILE, INC 122   2015-11-28   
603-957 3 Portsmouth NH   829J PAETEC ITEL, LLC 122   2006-03-20   
603-957 4 Portsmouth NH   8468 FREEDOM RING COMMUNICATIONS, LLC 122   2008-09-24   
603-957 5 Portsmouth NH   8468 FREEDOM RING COMMUNICATIONS, LLC 122   2009-07-15   
603-957 6 Portsmouth NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2011-06-19   
603-957 7 Portsmouth NH   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122   2011-06-19   
603-957 8 Portsmouth NH   6386 BELL ATLANTIC MOBILE, INC 122   2009-07-03   
603-957 9 Portsmouth NH   6386 BELL ATLANTIC MOBILE, INC 122   2017-02-17   
603-960 A Campton NH MNCHNHACAMD  6386 BELL ATLANTIC MOBILE, INC 122      
603-960 0 Campton NH   6386 BELL ATLANTIC MOBILE, INC 122   2008-03-16   
603-960 1 Campton NH   6386 BELL ATLANTIC MOBILE, INC 122   2008-07-03   
603-960 2 Campton NH   6386 BELL ATLANTIC MOBILE, INC 122   2008-10-03   
603-960 4 Campton NH   6386 BELL ATLANTIC MOBILE, INC 122   2011-05-14   
603-960 8 Campton NH   073H TELNYX LLC 122   2024-07-27   
603-960 9 Campton NH   793K TWC IP ENABLED SERVICES, LLC 122   2012-10-02   
603-961 A Chichester NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122      
603-961 0 Chichester NH   318J COMCAST IP PHONE, LLC 122   2010-01-25   
603-964 A Rye Beach NH RYBHNHCEDS0  5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-964 0 Rye Beach NH   318J COMCAST IP PHONE, LLC 122   2011-11-04   
603-964 1 Rye Beach NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      
603-964 2 Rye Beach NH   5113 CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 122      

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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