O2 (UK) Telefónica O2 had a long-standing relationship with Arsenal F.C., being their shirt sponsor until the end of the 2005/2006 season. In 2005, a three-year deal was signed that saw Telefónica O2 become the team's exclusive mobile communications partner. O2 were the main sponsor of the Channel 4 reality TV show "Big Brother" from its second series (as BT Cellnet) in 2001 until its fourth series in 2003. They also sponsored the spin-off shows "Celebrity Big Brother 2" in 2002 and "" in 2003. In total O2 sponsored five series of the show. O2 sponsored music festivals, the Wireless Festivals, from
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