O2 (UK) BT subsidiaries: Esat Digifone in Ireland, Viag Interkom in Germany and Telfort Mobiel in the Netherlands. The rebranding was supported by a European advertising campaign, which began on 16 April 2002, across all four countries, at a cost of £130 million. The main launch campaign ran from 18 June and was developed by Vallance Carruthers Coleman Priest, working alongside brand consultancy Lambie-Nairn, creators of the "O2" brand identity. In March 2005, mmO2 restructured its shares and the company was relisted as O2 plc. On 30 November 2005, O2 agreed to a takeover by Telefónica, a Spanish telecommunications company, for £17.7
O2 Money not preclude future partnerships with other banks. O2 Money has been described by Ronan Dunne, CEO at O2, as the first step in implementing NFC technology in mobile phones in the United Kingdom. The service received over 100,000 applications in the first seven weeks, making it the most successful financial card launch in the United Kingdom. Both cards were provided free and exclusive to O2 customers. A spokesman for O2 announced on 3 February 2011 the company’s plans to release a "mobile wallet" application, an NFC-powered mobile payment application for NFC-enabled smartphones in the second half of 2011. O2 has