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Simon Cox returns with a new series of Radio 4's guide to the digital world. In this first programme, as the UK enters the last phase of digital switchover all eyes are turning to the mobile technologies that will use the radio frequency spectrum previously taken up by analogue TV. Will it deliver the "broadband in your pocket" speeds we're being promised and more importantly when will we get it? Simon also looks into the other technologies that will connect us in the future including a revolutionary new approach using visible light.