Telefonica UK Limited, trading as O2 UK (stylised as O2), is a British telecommunications services provider. It is the largest mobile network in the United Kingdom, with approximately 23.2 million subscribers as of December 2024.
Since 2021, O2 UK has formed a subsidiary of Virgin Media O2, a 50:50 joint venture between Telefónica and Liberty Global formed through the merger of their respective O2 UK and Virgin Media businesses.
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O2 (typeset as O2) is a British brand owned by Spanish telecommunications company Telefónica, used for its subsidiaries in the United Kingdom and Germany, its former subsidiaries in the Czech Republic and Slovakia, and since 2018 as an online-only flanker brand in Spain. The O2 brand was created by British Telecom (BT) in 2001 ahead of the demerger of its global BT Wireless division as mmO2 plc (later O2 plc).
BT Wireless provided telecommunications services in the United Kingdom (BT Cellnet), Ireland (Digifone), Germany (VIAG Interkom), the Netherlands (Telfort), the Isle of Man (Manx Telecom), and a global mobile data business known as Genie Internet. Most of these operations were rebranded as O2 following the demerger from BT. In 2006, O2 plc was acquired by Telefónica, becoming Telefónica Europe. As part of a reorganisation of Telefónica in 2014, Telefónica Europe's holdings and operations became direct subsidiaries of its parent: Telefónica S.A.
51°30′10.14″N 0°0′11.22″E / 51.5028167°N 0.0031167°E
The O2 (formerly known as the Millennium Dome) is a large entertainment district on the Greenwich Peninsula in South East London, England, including an indoor arena, a music club, a Cineworld cinema, an exhibition space, piazzas, bars, restaurants, and a guided tour to the top of the O2. It was built largely within the former Millennium Dome, a large dome-shaped canopy built to house an exhibition celebrating the turn of the third millennium; consequently The Dome remains a name in common usage for the venue. It is sometimes referred to as The O2 Arena, but that name properly refers to the indoor arena within The O2. Naming rights to the district were purchased by the mobile telephone provider O2 from its developers, Anschutz Entertainment Group (AEG), during the development of the district. AEG owns the long-term lease on the O2 Arena and surrounding leisure space.
The O2 Arena, commonly known as the O2, is a multi-purpose indoor arena in the centre of The O2 entertainment district on the Greenwich Peninsula in southeast London, England. It opened in its present form in 2007. It has the third-highest seating capacity of any indoor venue in the United Kingdom, behind Co-op Live and Manchester Arena, and in 2008 was the world's busiest music arena.
The arena and broader complex were built within the former Millennium Dome, a large dome-shaped building intended for an exhibition celebrating the turn of the third millennium. As of 2022, it is the ninth-largest building in the world by volume with a diameter of 365 metres (399 yards) and a height of 52 metres (57 yards). It is named after its primary sponsor, the telecommunications company O2, a subsidiary of Virgin Media O2. The nearest tube station is North Greenwich on the Jubilee line.
The O2 (formerly known as the Millennium Dome) is a large entertainment district on the Greenwich Peninsula in South East London, England, including an indoor arena, a music club, a Cineworld cinema, an exhibition space, piazzas, bars, restaurants, and a guided tour to the top of the O2. It was built largely within the former Millennium Dome, a large dome-shaped canopy built to house an exhibition celebrating the turn of the third millennium; consequently The Dome remains a name in common usage for the venue. It is sometimes referred to as The O2 Arena, but that name properly refers to the indoor arena within The O2. Naming rights to the district were purchased by the mobile telephone provider O2 from its developers, Anschutz Entertainment Group (AEG), during the development of the district. AEG owns the long-term lease on the O2 Arena and surrounding leisure space.
From the closure of the original Millennium Experience exhibition occupying the site, several ways of reusing the Millennium Dome's shell were proposed and then rejected. The renaming of the Dome in 2005 gave publicity to its transition into an entertainment district. The Dome's shell remained in situ, but its interior and the area around North Greenwich Station, the QE2 pier and the main entrance area were completely redeveloped.