By 2018, two-thirds of Britons will own a smartphone and be an avid tablet user, according to new research. The surge in popularity of portable devices to consume TV, video and other media shows no signs of abating, according to media agency ZenithOptimedia's New Media Forecast. The report found that by the end of this year, 51% of Britons will own a tablet, up from just 3.5% just five years ago. By 2018, 65% of Britons will own or have regular access to a tablet device.