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
O2 (Ireland) Ireland and Three Ireland, offering services in some built-up areas in late 2006. In July 2007, O2 launched its mobile broadband offering in Ireland using HSDPA technology over its 3G network. They provided speeds of up to 7.2 Mbit/s and claimed to cover 90% of the population on the least contended Irish 3G network following an upgrade in 2007. Speak Easy was the name of O2 Ireland's prepaid service. In 2007 they became the first Irish operator to offer free text messages to all Irish mobile numbers, although it only applied for weekends. However, in early 2008 they introduced a