In Beijing, anxious relatives continue to wait for word about the fate of Malaysia Airlines Flight 370. The Beijing-bound jet disappeared on Saturday. Mark Ralston /AFP/Getty Images hide caption

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A passenger checks his cellphone while boarding a flight in Boston. The Federal Communications Commission is proposing new rules to allow using cellphones for data and voice calls during airline flights. Matt Slocum/AP hide caption

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The new head of the Federal Communications Commission says his agency is reviewing restrictions on in-flight cellphone use. Here, a passenger looks at her cellphone before a flight last month. Matt Slocum/AP hide caption

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The new head of the Federal Communications Commission proposes allowing airline passengers to make phone calls during flights. Here, a passenger looks at her cellphone before a flight last month. Matt Slocum/AP hide caption

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Cell towers are constantly tracking the location of mobile phones. And that data, federal courts have ruled, is not constitutionally protected. Steve Greer/iStockphoto.com hide caption

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A row of beer cans in Australia, where a man's beer fridge has been blamed for playing havoc with the cellphone network in several neighborhoods. Torsten Blackwood/AFP/Getty Images hide caption

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A young boy plays on a commode during an event for World Toilet Day in New Delhi in November. An estimated 131 million Indian homes don't have a latrine or a clean toilet. Raveendran/AFP/Getty Images hide caption

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More than 90 percent of Kenyans use mobile phones, giving scientists a powerful tool to track how diseases spread. Simon Maina/AFP/Getty Images hide caption

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The latest study to look at cellphone safety found no increased risk of brain cancer.

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Apple marketing executive Phil Schiller describes the new iPhone 4S's camera, which includes 1080p HD video, at Apple headquarters in Cupertino, Calif.

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Two women check their cellphones as they hawk their wares on a bridge over the Artibonite River, whose waters are believed to be the source of Haiti's 2010 cholera outbreak. Nicholas Kamm/AFP/Getty Images hide caption

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