Today mobile communication devices are becoming much more technologically advanced and offer more features than just conversation. In cell phone, global positioning system (GPS) tracking is one of those advances. Tracking devices can be used to drive a car through traffic day-to-day or vehicle fleet tracking. Not only can a driver use an auto GPS system for directions, but also the corporate office knows where each vehicle is. In fact, all businesses are under pressure to monitor their shipments in order to enhance security and efficiency. GPS Systems can be used while outdoors for activities such as hiking or camping. As GPS technology has become more important and accessible to consumers, the varieties of GPS enabled devices have also increased at an incredible rate. At the time that the technology gets more advanced, even smaller and more versatile, handheld portable GPS devices are becoming increasingly popular like mobile phones. The popularity of mobile devices is significantly higher among the youngest individuals. In Portugal, according to an INE statistic, 85% of the population aging between 10 to 15 years old uses mobile phones [1]. This paper proposes a system that uses a regular mobile phone or a personal digital assistant (PDA) equipped with a GPS receptor and connected to a global system for mobile (GSM) network that takes advantage of these technologies in behalf of the user safety.