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 Racing Technology O2 Racing Technology O2 Racing Technology (also known as Genoa Racing) was an American auto racing team owned by Mark Olson that competed in the Indy Lights series. The team ran the No. 36 and 63 entries in the Indy Lights series for 2011 with Peter Dempsey and Mikaël Grenier. They were suspended from Indy Lights along with owner Mark Olson until the end of 2012 over issues with the David Hobbs 100 at the Milwaukee Mile and the team withdrawing. IndyCar accused the team and owner of four Indy Lights rule book violations because of their interference with the