BT Group Plc's pursuit of O2 or EE, Britain's two biggest mobile phone operators, prompted predictions of a wave of dealmaking in the U.K. The interest shown by Vodafone Group Plc in Liberty Global Plc shows that's not just idle speculation. BT is already the biggest U.K. broadband provider so a purchase of O2, owned by Spain's Telefonica SA, or EE, a joint venture between Deutsche Telekom AG and France's Orange SA, would restore the former state telephone monopoly to a dominant position in the country.