Hillary Clinton, while U.S. secretary of state, checks her Blackberry on a military plane in October 2011. Clinton said she used a private email account for her official work at the State Department and that she did so out of convenience. But she admitted in retrospect "it would have been better" to use multiple emails.
Clinton checks her phone after addressing the U.N. Security Council in March 2012.
Clinton looks at her phone after attending a Russia-U.S. meeting in Hanoi, Vietnam, in July 2010.
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Clinton types on her phone during a visit to Brasilia, Brazil, in April 2012.
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Clinton hands off her phone after arriving to meet with Dutch Foreign Minister Uri Rosenthal in The Hague, Netherlands, in December 2011.
J. Scott Applewhite/Pool/AP
Clinton speaks on a phone in the lobby of a Honolulu hotel before briefing reporters on the Haiti earthquake in January 2010.
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Clinton looks at a phone with Assistant Secretary of State for European Affairs Philip Gordon as they wait in a Munich, Germany, conference room for a bilateral meeting with the Ukrainian President in February 2012.