This thesis assesses the surveillance operated on the mobile phone network by governmental actors (intelligence agencies, police, army) and the relationship between monitored spaces and their users. Indeed, some new surveillance devices used by intelligence services redefine surveillance spatiality raising new questions in this field of research. More specifically this research focuses on one specific object: the IMSI catcher, a monitoring apparatus of the cellular network that intercepts cellphones' identity and some communications in a given area by mimicking the activity of a cell tower. While this kind of device seems to offer a tactical and a security interest in the fight against terrorism and against crime, many civil liberties organisations such as the Electronic Frontier Foundation, Privacy International and _La Commission nationale de l'informatique et des libertés are concerned about the potential of an uncontrolled surveillance ; indeed, the controversial nature of the device could endanger certain individual and public rights. What is this technical object and which new issues comes with its use in surveillance? How and from which perspective is it problematic What does the IMSI catcher teaches us on the potential future of surveillance regimes? I look into this specific device case in a research framework at the intersection of design research practices, science and technology studies (STS) and surveillance studies. First, I deal with this surveillance apparatus as a technical object, from a perspective fed by the theoretical framework of concretization and technical lines proposed by Gilbert Simondon and Yves Deforge, through the analysis of a visual and technical documentation. Second, I use a research by design approach to explore certain assumptions regarding the nature of the object itself, its functioning and its "concrete" aspect â or rather "non-concrete" in the present case â with the help of approaches borrowed to reverse engineering and reconstitution, close to media archeology. Then, I explore possible opposition and protest trajectories with the help of prototypes designed with critical design and speculative design methods. Finally, through the writing of prospective scenarios, I build a design fiction that offers a synthesis, potentially subject to debate, around the IMSI catcher's uses, present and to come, and more broadly on the potential future of surveillance regimes.