Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-981 A Chicago Zone 01-Superior IL CHCGILWUDS0  7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358      
312-981 0 Chicago Zone 01-Superior IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358      
312-981 1 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358   2001-12-18   
312-981 2 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358   2001-12-07   
312-981 3 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358   2001-12-07   
312-981 4 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358   2000-06-30   
312-981 5 Chicago Zone 01-Superior IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358      
312-981 6 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358   2000-06-30   
312-981 7 Chicago Zone 01-Superior IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2007-05-18   
312-981 8 Chicago Zone 01-Superior IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2001-01-18   
312-981 9 Chicago Zone 01-Superior IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-08-07   

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

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