Twenty-nine percent of all cellphone owners described their phone as "something they can't imagine living without," according to a Pew Research Center survey. iStockphoto hide caption

itoggle caption iStockphoto

Manic, sad, up, down. Your voice may reveal mood shifts. iStockphoto hide caption

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He's not checking your blood glucose levels. He's playing Words with Friends. Anna Zielinska/iStockphoto.com hide caption

itoggle caption Anna Zielinska/iStockphoto.com

Nokia was the only large phone manufacturer in the world to commit to selling phones running Microsoft's operating system. Now Microsoft is buying Nokia's mobile phone business. Timothy Clary/AFP/Getty Images hide caption

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The GetHealth app was a runner-up at the recent Hackovate Health Innovation Competition held in Kansas City, Mo. Courtesy of GetHealth Limited hide caption

itoggle caption Courtesy of GetHealth Limited

Smartphones based on Ubuntu, a Linux-based operating system, are expected in 2014. Canonical hide caption

itoggle caption Canonical

A salesperson demonstrates the Apple iPhone 4 in New Delhi, India. While mobile device use is growing rapidly in emerging markets, Apple's current product line may prove prohibitively expensive for many consumers. Manish Swarup/AP hide caption

itoggle caption Manish Swarup/AP