O2 (Ireland) BT Group and 1 mm02 share for each British Telecommunications share they held. After the de-merger, most of mmO2's operations, including Digifone, were rebranded O2. mmO2 plc later became O2 plc and remained an independent company until 2005. On 31 October 2005 it was announced that Telefónica, S.A., the Spanish telecommunications company, had made a recommended takeover bid for O Ireland's parent company, O2 plc. This was then approved by shareholders and O was officially purchased in mid February 2006. The O2 brand is now used in several countries for Telefónica's mobile operations outside Spain and Latin America, where Telefónica
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