O₂ (UK)

==Cellnet==
===1985–1990===
====1985–1988====
====1988–1990====
===1990–1999===
==BT Cellnet==
===1999–2002===
In 1999, BT Group acquired Securicor's 40 percent share of Cellnet and the company was later rebranded as BT Cellnet.
==O2==
===2002–present===
In 2001, BT Wireless demerged from BT and took the name mmO2 plc. While mmO2 plc was created in 2001, the O2 consumer brand was introduced on 19 June 2002 in the United Kingdom, Germany, Ireland and the Netherlands (where it lasted for only a year before reverting to Telfort). The rebranding was supported by a European advertising campaign, which began on 16 April 2002 across all four countries. Lambie-Nairn created the O2 brand identity.
Spanish telecommunications company Telefónica acquired O2 in the United Kingdom, Ireland and Germany in early 2006.
O2 and Virgin Media merged on 1 June 2021 creating Virgin Media O2. It will be a 50/50 joint venture between Telefónica and Liberty Global.
However, O2 will continue trading with this name as a subsidiary of Virgin Media O2.
Category:Telefónica
Category:Berkshire
Category:Slough
Category:Telecommunications
Category:Cell phone providers
Category:Mobile network operators
Category:Telecommunications companies in the United Kingdom
Category:Mobile phone companies in the United Kingdom
Category:Mergers
Category:1985