Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

NXX: 226

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-226 A Naperville IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
331-226 0 Naperville IL   224C ONVOY, LLC 358   2017-06-22   
331-226 1 Naperville IL   224C ONVOY, LLC 358   2017-06-22   
331-226 2 Naperville IL   318J COMCAST IP PHONE, LLC 358   2017-06-06   
331-226 3 Naperville IL   6529 T-MOBILE USA, INC. 358   2017-05-18   
331-226 4 Naperville IL   6529 T-MOBILE USA, INC. 358   2017-05-18   
331-226 5 Naperville IL   6529 T-MOBILE USA, INC. 358   2017-05-18   
331-226 6 Naperville IL   6529 T-MOBILE USA, INC. 358   2017-05-18   
331-226 7 Naperville IL   6529 T-MOBILE USA, INC. 358   2017-05-18   
331-226 8 Naperville IL   6529 T-MOBILE USA, INC. 358   2017-05-18   
331-226 9 Naperville IL   6529 T-MOBILE USA, INC. 358   2017-05-18   

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

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