Uk mobile telecom?

O2 plc (known prior to March 2005 as mmO2 and usually stylised as O2, like the chemical symbol) is a British telecommunications company specialising in mobile phones. The company was previously part of BT Group plc as BT Cellnet. After a period of independence it was acquired by Telefónica of Spain, with the offer becoming unconditional on 23 January 2006. At 31 December 2005 the company had 27.4 million customers in the UK, Germany and Republic of Ireland. The company headquarters are in Slough, with major offices in Bury, Glasgow, Leeds, and Preston Brook. It has both retail outlets and technology sites located around the UK.