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]

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-999 4 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2021-11-11   
603-999 5 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2021-11-11   
603-999 6 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2021-11-11   
603-999 7 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2022-01-07   
603-999 8 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2022-01-07   
603-999 9 Salem NH MNCHNHCO26Z  965H FRACTEL, LLC 122   2020-01-30   

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

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