Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 979

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-979 A Columbia MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-979 0 Columbia MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-01-19   
443-979 1 Columbia MD   5562 METROPCS, INC. 238   2013-07-25   
443-979 2 Columbia MD   5562 METROPCS, INC. 238   2014-11-22   
443-979 3 Columbia MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-01   
443-979 4 Columbia MD   5562 METROPCS, INC. 238   2014-12-29   
443-979 5 Columbia MD   5562 METROPCS, INC. 238   2014-12-29   
443-979 6 Columbia MD   5562 METROPCS, INC. 238   2015-03-06   
443-979 7 Columbia MD   318J COMCAST IP PHONE, LLC 238   2014-11-20   
443-979 8 Columbia MD   876D ONVOY, LLC - MD 238   2014-10-20   
443-979 9 Columbia MD   876D ONVOY, LLC - MD 238   2014-10-20   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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