Dow Jones Newswires reports that UK mobile phone retailer and broadband provider Carphone Warehouse Group PLC today split into two separately-listed companies, 21 years after Charles Dunstone founded the company. The two companies, fixed-line broadband business TalkTalk Telecom Group PLC and retailer Carphone Warehouse Group PLC, debuted on the London Stock Exchange at £1.27 and £1.35, respectively.