Question: Which company did Sir Charles William Dunstone formerly serve as chairman and also trades under the name Phone House?
Sentence (from "Charles Dunstone"): Sir Charles William Dunstone, CVO (born 21 November 1964) is the co-founder and former chairman of mobile phone retailer Carphone Warehouse, former chairman of multinational electrical and telecommunications retailer and services company Dixons Carphone (formed on 7 August 2014 by the merger of Dixons Retail and Carphone Warehouse), and executive chairman of the TalkTalk Group.
Relevant evidence: Yes