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
312-837 A Chicago Zone 01-Calumet IL   7607 COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL 358      
312-837 0 Chicago Zone 01-Calumet IL   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2015-10-19   
312-837 1 Chicago Zone 01-Calumet IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2015-11-04   
312-837 2 Chicago Zone 01-Calumet IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2016-06-17   
312-837 3 Chicago Zone 01-Calumet IL   7607 COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL 358   2015-10-18   
312-837 4 Chicago Zone 01-Calumet IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2015-11-04   
312-837 5 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2015-10-26   
312-837 6 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2015-10-26   
312-837 7 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2015-10-26   
312-837 8 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2015-10-26   
312-837 9 Chicago Zone 01-Calumet IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-11-23   

Last updated: Wed, 05 Feb 2020 02:15:44 UTC

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