Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

Block: A

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-946 A Glen Ellyn IL CHCGILWURMD  965H FRACTEL LLC 358      
331-979 A Elmhurst IL CHCIILNQPS3  7607 COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL 358      
331-980 A Aurora IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358      
331-998 A Downers Grove IL ELGNIL32CM2  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
331-999 A Oswego IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358      

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Last updated: Sun, 04 Apr 2021 19:28:27 UTC

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