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The profits generated by some technology firms are awe-inspiring, serving as beacons for those at less fortunate enterprises. Devices have accounted for a large part of that success, particularly smartphones. But challengers trying to follow this route to profits are likely to be disappointed

The lights are off. You’re in bed, tossing and turning, worrying about the things you have to do the next day. You reach for your phone; its glowing surface turns the bedroom into a tableau of blue, grey and black. You check e-mails, scroll through Facebook, look at Twitter