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Nowadays the use of smart phones gets more and more widespread in the whole world. How could smart phones be used to make lives healthier? Smart phones could get to know when people were jogging, walking, travelling and standing on the basis of the GPS co-ordinates and the measured speed and could calculate the time spent relaxing with the help of a gyroscope. Portable sensors that are able to communicate wireless could provide further data about the momentary state of health and the need for fluid and calories. A smart phone could recognize the sudden change of the bodily position and could decide on the level of the seriousness of the situation by evaluating the values measured by the sensors. It is also worth sending a message to the ambulance if the fall is the consequence of losing consciousness, the measured data, the patient's condition and GPS positions can be life-saving information. In case of the indisposition of a driver, a smart phone could send instructions to the vehicle to take over the control from him and not to allow him to use the steering wheel or the pedals, the vehicle itself is to use them properly. It is to switch on the hazard warning flasher and the phone will drive the vehicle off the road to its edge while gradually decreasing the speed and paying attention to the position and the movements of the surrounding vehicles, objects, people and other living creatures. In the meantime the phone could also call the ambulance and send information about the precise location and the measured data. It might happen that the heart of a patient stops beating while driving or in other circumstances or that it beats so fast that it can not pump the blood. In such cases a smart phone could realize the problem with the help of a pulse counter (sphygmograph) and could make an attempt to resuscitate the patient with the defibrillator attached to it.