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Explore a 59-minute conference talk that delves into the widespread surveillance of mobile phone data through cell tower queries. Learn how police and intelligence agencies routinely collect millions of location data points, with network operators providing datasets of all mobile numbers present in specific cell areas at given times. Discover the civil rights implications of this mass surveillance practice and how it often occurs without the knowledge of those affected, despite legal requirements. Examine the Berlin Cell Tower Query Transparency System, a tool designed to shed light on these surveillance measures. Gain insights into the global context of cell tower queries, related data retention practices, and the future of privacy protection efforts.