Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 309 [Rate centres in NPA 309] [Dial plan for NPA 309]

NXX: 707

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
309-707 A Cambridge IL GENSILXD2MD  846F MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 634      
309-707 1 Cambridge IL GENSILXD2MD  846F MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 634   2010-04-15   
309-707 7 Cambridge IL   145J TERRA NOVA TELECOM INC. 634   2025-06-01   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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