O2 (UK) Telefónica O2 had a long-standing relationship with Arsenal F.C., being their shirt sponsor until the end of the 2005/2006 season. In 2005, a three-year deal was signed that saw Telefónica O2 become the team's exclusive mobile communications partner. O2 were the main sponsor of the Channel 4 reality TV show "Big Brother" from its second series (as BT Cellnet) in 2001 until its fourth series in 2003. They also sponsored the spin-off shows "Celebrity Big Brother 2" in 2002 and "" in 2003. In total O2 sponsored five series of the show. O2 sponsored music festivals, the Wireless Festivals, from
O2 Global Network O2 Global Network O2 Global Network (O2 International Network for Sustainable Design, stylized as O Global Network) is an international network for people interested in sustainable design. The network is made up of the O2 Global Network foundation, regional hubs, local groups, liaisons and individuals (called O2's). It has currently more than 70 country contacts. O2 ("Oxygen") was founded in 1988 in Milan by Niels Peter Flint, Thierry Kazazian, Jorgi Scheicher, Jeremy Quinn and others. O2 Groups in Denmark, Finland, France, Sweden and the United Kingdom followed. Six years later (5 July 1994), Iris de Graaf and Willem Hanhart founded