A cell phone you can keep forever

SAN FRANCISCO, CA - JUNE 05:  A pedestrian uses a smartphone as he walks along Market Street on June 5, 2013 in San Francisco, California.  According to a study by the Pew Internet & American Life Project, over half of American adults, or 56 percent, have smartphones, up from 35 percent two years ago.  (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO, CA - JUNE 05:  A pedestrian uses a smartphone as he walks along Market Street on June 5, 2013 in San Francisco, California.  According to a study by the Pew Internet & American Life Project, over half of American adults, or 56 percent, have smartphones, up from 35 percent two years ago.  (Photo by Justin Sullivan/Getty Images)

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    A cell phone you can keep forever

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