The main “spy thing” today is the mobile phone. Spyware is capable of monitoring activity on the mobile device on which it is installed. Text messages dialed on the phone, incoming and outgoing calls along with call duration, SMS, MMS, email, any data received or transmitted via the Internet, device coordinates - all this will be available for viewing at any time of the day. The best spyware also listens to and records conversations through a mobile device, turning the phone into a real electronic bug. Of course, existing anti-spyware antiviruses are also described that allow you to detect and destroy spyware on your mobile phone. The book also covers traditional spyware and anti-spyware things: presented circuit designs of devices for obtaining information and protecting their information from leakage. The diagrams are accompanied by descriptions, recommendations for assembly and configuration. All these designs are available to home craftsmen. The book is intended for a wide range of readers.