Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 437 [Rate centres in NPA 437] [Dial plan for NPA 437]

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date

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Last updated: Sat, 04 Jul 2026 13:07:56 UTC

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