Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 346 [Rate centres in NPA 346] [Dial plan for NPA 346]

NXX: 557

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
346-557 A Houston Suburban TX HSTNTXPB6MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 560      
346-557 0 Houston Suburban TX   318J COMCAST IP PHONE, LLC 560   2023-11-23   
346-557 1 Houston Suburban TX   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 560   2022-07-24   
346-557 2 Houston Suburban TX   318J COMCAST IP PHONE, LLC 560   2023-11-23   
346-557 3 Houston Suburban TX   318J COMCAST IP PHONE, LLC 560   2023-11-23   
346-557 4 Houston Suburban TX   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 560   2022-07-24   
346-557 5 Houston Suburban TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2023-12-17   
346-557 6 Houston Suburban TX   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 560   2022-07-24   
346-557 7 Houston Suburban TX   318J COMCAST IP PHONE, LLC 560   2023-11-23   
346-557 8 Houston Suburban TX   318J COMCAST IP PHONE, LLC 560   2023-11-23   
346-557 9 Houston Suburban TX   318J COMCAST IP PHONE, LLC 560   2023-11-23   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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