Privacy and security of contact data on mobile phones with Windows Phone Operating System

In this paper we present analysis of how contact data is managed by Windows on mobile phones and our approach in making it more private. Aim of this work was to design and develop application that can store contacts locally in memory of device with installed Windows Phone 8.1 operating system. That application can be used to create, edit, and remove contacts without usage of Microsoft cloud services. Developed application also allows to send text messages, e-mails, and call to saved telephone number.