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
GTT Communications GTT Communications GTT Communications, Inc. (GTT), formerly Global Telecom and Technology, is a multinational telecommunications and internet provider company with headquarters in McLean, Virginia. GTT operates a Tier 1 IP network, and provides IP transit, MPLS transport services, managed services, voice and unified communications to enterprise, government, and carrier customers in over 100 countries. In 1998, telecom services integrator and network solutions provider Global Internetworking Inc. was founded in McLean, Virginia. That same year, European Telecom and Technology was founded in London. In April 2005, Mercator Partners Acquisition Corp., a special purpose acquisition company created by Reston-based investment bank Mercator