Local Calling Guide

Area code/prefix search

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Dow City, IA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
712-412 A OMAHNENWXPX  221F ONVOY, LLC - IA 644      
712-412 1   221F ONVOY, LLC - IA 644   2023-10-01   
712-412 2   221F ONVOY, LLC - IA 644   2021-05-10   
712-412 3   624H ONVOY SPECTRUM, LLC 644   2021-11-04   
712-412 4   221F ONVOY, LLC - IA 644   2018-12-22   
712-412 5   221F ONVOY, LLC - IA 644   2021-04-23   
712-412 6   221F ONVOY, LLC - IA 644   2021-04-23   
712-412 8   624H ONVOY SPECTRUM, LLC 644   2021-07-18   
712-674 A DWCYIAXORS6  1127 FRONTIER COMMUNICATIONS OF IOWA, INC. 644      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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