In this photo taken Sept. 21, 2012, programmers work at the Lookout Mobile Security headquarters in San Francisco. A woman riding a city bus is punched in the face, then her cell phone

 

              In this photo taken Sept. 21, 2012, programmers work at the Lookout Mobile Security headquarters in San Francisco. A woman riding a city bus is punched in the face, then her cell phone
In this photo taken Sept. 21, 2012, programmers work 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. (AP Photo/Marcio Jose Sanchez)