If the recession is the cloud hanging over the mobile-phone business, "smart" phones are the silver lining. Sales of mobile phones were 10% lower in the second quarter of this year than in the same period last year, but sales of smart-phones were up by nearly 15%, according to idc, a market-research firm. By some estimates, half of all handsets sold will be "smart" in four years and by 2015 almost all will be.
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