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 (Ireland) their bills on time in August 2008. The Advertising Standards Authority upheld complaints concerning advertisements by O2. In August 2010, O2 was warned by the telecoms watchdog, ComReg, that it could not move customers to online billing without their explicit agreement. In March 2011, O2 pleaded guilty to a breach of the Data Protection Act at the Dublin District Court. In March 2011, it was revealed that Denis O'Brien made payments to the Minister for Communications, Michael Lowry, to aid Esat Digifone's licence bid. O2 (Ireland) Telefónica Ireland was a broadband and telecommunications provider in Ireland that traded under the