Local Calling Guide

Area code/prefix search

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NPA: 289 [Rate centres in NPA 289] [Dial plan for NPA 289]

NXX: 857

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
289-857 A Thornhill ON RMHLON34CMD  464D FIBERNETICS CORPORATION 888 805145    

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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