For years, most of us had just one screen in our living rooms: the television. Over the past decade, laptops, tablets and smartphones have all muscled in on this relationship. Of the newer screens, the smart-phone has been the most successful: it has had the most commercial impact - it clocked up £250bn in global sales last year. It has the highest unit sales, with 1.4 billion forecast to be sold this year, of which 1 billion will be purchased as (significantly improved) upgrades. Ten years back, smartphones were expensive, compromised devices, often with more promise than punch. As of May 2015, Deloitte estimates that 76% of UK adults had a smartphone, up six percentage points from last year (see chart, opposite).
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