Vodafone have made £10.2 Billion in the last year which is more than the oil company Shell who made £10.1 Billion. Vodafone was looked at the OFTEL some time ago because of its large profit margins.
http://news.bbc.co.uk/1/hi/business/4573347.stm
http://news.bbc.co.uk/1/hi/business/4573347.stm