Our research project deals with uses of the new kinds of mobile terminals - phones, tablets, e-books and various digital processes - and intends to analyze them according to a specific approach, that has to do with information and communication sciences. It allows us to measure, thanks to an anthropological point of view, what these uses and practices generate in terms of changes of uses. Our approach tries to emphasize the context in which the user is immersed. In this way, we propose a method of observation which, according to us, is a precious contribution: glasses-cameras. They allow us tostudy the enrolment of these new uses in what turns out to be a complex technique, made of media metastable practices, that are at the same time static and dynamic.