Samsung knocks Nokia off perch at top of global mobile market. - According to estimates from Gartner information technology researchers, the Korean Samsung group has become the leader in mobile telephone sales, having overtaken the Finnish company, Nokia, in the first quarter of 2012. In the first three months of 2012, Samsung sold around 22 million phones (25.4% of market share), as opposed to 83 million (22.5% of market share) sold by its Finnish rival. In 2011 taken as a whole, Nokia was...