A man and a woman speak on cell phones near a telephone booth in London, U.K., Wednesday, October 18, 2006.
FILE - In this Thursday, June 6, 2013, file photo, pedestrians use their cell phones as they pass a Verizon Wireless store near Union Square, in New York. Verizon Communications announced Wednesday, Sept 11, 2013, it has sold $49 billion in bonds, the largest corporate bond sale in history. (AP Photo/John Minchillo, File)
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Cell phones sit on display in the window of a store on January 14, 2013 in New York City.
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Cell phones on campus
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Sen. Rand Paul holds up a group of cell phones in front of U.S. District Court to announce the filing of a class action lawsuit against the administration of U.S. President Barack Obama, Feb. 12. 2014.
ANN STATES FOR TIME
Cell phones are constant companions for Atlanta teenager Royce Badger, right, and friends
Cancer not calling: Cell phones have received a provisional clean bill of health
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Correctional Officer Jose Sandoval inspects one of the more than 2,000 cell phones confiscated from inmates at Calfornia State Prison in Vacaville, California.
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Officials secure an area in Watertown, Mass., Friday, April 19, 2013. There were reports of explosives being detonated and police telling reporters to turn off their cell phones.