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
Concentration of media ownership Four" of American network (terrestrial) television (this despite the fact that the CW was, in fact, partially owned by one of the Big Four in CBS). In television, the vast majority of broadcast and basic cable networks, over a hundred in all, are controlled by eight corporations: 21st Century Fox (the Fox family of channels), The Walt Disney Company (which includes the ABC, ESPN and Disney brands), National Amusements (which includes CBS Corporation and Viacom), Comcast (which includes the NBC brands), AT&T (which owns WarnerMedia), Discovery Communications, E. W. Scripps Company, Cablevision (now known as Altice USA), or some combination