O2 (UK) O2 (UK) Telefónica UK Limited (trading as O2 – stylised as O) is a telecommunications services provider in the United Kingdom, owned by the Spanish multinational Telefónica, and is headquartered in Slough. With 25 million subscribers (as of December 2017), O2 is the second-largest mobile network operator in the United Kingdom after EE, with Vodafone in third place. O2 was formed in 1985 as Cellnet, a 60:40 joint venture between BT Group and Securicor. In 1999, BT Group acquired Securicor's share of Cellnet and the company was later rebranded as BT Cellnet. In June 2000, BT Cellnet launched the world's
O2 Racing Technology running of the event. The appeal of the penalties were later denied in July 2011. The issues with Olson and Indycar were resolved in late 2013. 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