In a strong defense of digital age privacy, a unanimous Supreme Court ruled Wednesday that police may not generally search the cellphones of people they arrest without first getting search warrants. Cellphones are powerful devices unlike anything else police may find on someone they arrest, Chief Justice John Roberts said for the court. Because the phones contain so much information, police must get a warrant before looking through them, Roberts said. "Modern cellphones are not just another technological convenience. With all they contain and all they may reveal, they hold for many Americans the privacies of life," Roberts said. The message to police about what they should do before rummaging through a cellphone's contents following an arrest is simple. "Get a warrant," Roberts said. The court chose not to extend earlier rulings that allow police to empty a suspect's pockets and examine whatever they find to ensure officers' safet...