Just about all technology can be very useful to make life better and at the same time can be used for nefarious purposes. When I first read about this my mind immediately went to the Tom Cruise movie "Minority Report" where he's walking down town and every ad reads his eyes and delivers messages by name directly to him. He eventually has his eyes surgically replaced to avoid detection. Why in essence this technology could make your phone safer, no doubt it could be used as an affliction against humanity.