UPDATE 2-Competition hots up for UK's 4G mobile phone airwaves
By Paul Sandle LONDON, Dec 20 (Reuters) - Seven companies were named on Thursday as bidders for the superfast 4G mobile broadband radio frequencies to be auctioned off in Britain next month by industry regulator Ofcom. Existing mobile network operators EE, Vodafone, O2 owner Telefonica and Hutchison
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