Bachelor Thesis from the year 2011 in the subject Computer Science - IT-Security, Helsinki Metropolia University of Applied Sciences, language: English, abstract: The main purpose was to study the concept behind developing spying software. The goal of this project was to develop a mobile phone tracking application for Google Android phones. The application was expected to include the use of GPS and Cell-ID to track the location of a mobile phone. The Google Android SDK was used to develop the tracking software application. The application was tested on a Google Android mobile phone. The result showed that the development process of location and maps-based applications was fast while using Google Android. This was because of two main reasons. First, Google Android Provided APIs for location-based services such as GPS and Cell-ID. Second, having Eclipse with ADT plug-in as the choice to develop the application led to an easy means of debugging and testing. The tracking application was found important to use since it will allow users to trace lost phones or to locate lost people. The application can be developed further by adding a number of features to it such as running in the background, SMS copying and making a spy call.