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In this photo taken Sept. 21, 2012, Kevin Mahaffey, chief technology officer and co-founder, poses for a portrait at the Lookout Mobile Security headquarters in San Francisco. A woman riding a city bus is punched in the face, then her cell phone is snatched. A man walking near Golden Gate Park is asked for the time, then a gunman demands his phone and wallet. Police say nearly one out of every three robberies in San Francisco this year has involved a cell phone.

Marcio Sanchez / Associated Press