O2 (UK) they can do it too" in reference to Vodafone and EE, O2's biggest competitors and the UK's top three mobile-telecoms companies. 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
The O2 in October 2018, completes the loop of The O2, adding an extra floor in parts and providing space for 85 stores. Brands that have signed deals to take space include handbags maker Aspinal of London, Calvin Klein, Hackett, Ted Baker, Gant and Levi’s. In late 2007, Marine engineering consultancy, Beckett Rankine, were appointed to investigate the possibility of a cruise ship terminal being built. In 2012 it was reported that the O2 would be sold by its owners, Anschutz Entertainment Group (AEG), as part of the disposal of the entire company's assets, rumoured to be valued around $7 billion. The