Your smartphone is dumb. Mine is too. I've got an iPhone in my pocket, and a Galaxy S III, and an HTC One, and they're all stupid. The BlackBerry Z10 in my bag is a clot, and the Lumia 920 isn't just thick in the hand, it's just plain thick. Today, on the fortieth birthday of the first cellphone call, the gadget that was supposed to liberate us has turned us into plagued, screen-tapping obsessives, in thrall to every buzz and bleep.