Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 640 [Rate centres in NPA 640] [Dial plan for NPA 640]

NXX: 299

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
640-299 A Lawrenceville NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2026-03-20   
640-299 0 Lawrenceville NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2026-03-20   
640-299 7 Lawrenceville NJ CMDNNJCEXQY  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2026-03-28   
640-299 8 Lawrenceville NJ CMDNNJCEXQY  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2026-03-28   
640-299 9 Lawrenceville NJ CMDNNJCEXQY  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2026-03-28   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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