I had go through this book and I was found that the technique and guide given this book is not for now a days mobile phones. Even a simple password cracking and bypassing is not possible with those methods given in this book. This is all about when Bluetooth of someones phone is on but in most cases no one switched-on Bluetooth in market place and home also because this is the age of fourth generation mobile phone so this book is for basic hackers and mobile users not for me like expert