Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 309 [Rate centres in NPA 309] [Dial plan for NPA 309]

NXX: 812

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
309-812 A Carlock IL BLTNILTSYMD  495J STRATUS NETWORKS 366      
309-812 0 Carlock IL   073H TELNYX LLC 366   2020-12-26   
309-812 1 Carlock IL   495J STRATUS NETWORKS 366   2020-11-18   
309-812 2 Carlock IL   224C ONVOY, LLC 366   2021-04-03   
309-812 3 Carlock IL   624H ONVOY SPECTRUM, LLC 366   2023-06-02   
309-812 8 Carlock IL   224C ONVOY, LLC 366   2021-02-12   

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

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