O2 (UK) BT subsidiaries: Esat Digifone in Ireland, Viag Interkom in Germany and Telfort Mobiel in the Netherlands. The rebranding was supported by a European advertising campaign, which began on 16 April 2002, across all four countries, at a cost of £130 million. The main launch campaign ran from 18 June and was developed by Vallance Carruthers Coleman Priest, working alongside brand consultancy Lambie-Nairn, creators of the "O2" brand identity. In March 2005, mmO2 restructured its shares and the company was relisted as O2 plc. On 30 November 2005, O2 agreed to a takeover by Telefónica, a Spanish telecommunications company, for £17.7
Rochester Telephone Corporation for resale. In their early years, the company's subsidiaries reported strong profits. In 1983, as the federal government's breakup of the Bell telephone monopoly increased competition in the telecommunications industry dramatically, Rochester Telephone launched its second unregulated venture, founding the RCI Corporation. RCI installed a microwave communications network in New York State and a fiber optic hookup with Chicago. After purchasing an additional fiber optic link with Washington, D.C., the company's operations spanned 12 cities. In the mid-1980s, Rochester Telephone also entered the new radio telephone industry, when it founded Rochester Tel Mobile Communications. By the end of the decade,