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Florian Bemmann, Maximiliane Windl, Tobias Knobloch, Sven Mayer
European Users' In-Depth Privacy Concerns with Smartphone Data Collection
MobileHCI 2025, Sept. 22 - 25, 2025, Sharm El-Sheikh, Egypt (bib)

Today's context-aware mobile phones allow developers to build intelligent and adaptive applications. The data demand induced by context awareness leads to decreased trust and increased privacy concerns. However, users' deeper reasons and real-world fears that underlie these concerns are not fully understood. We conducted an online survey (N=100) and semi-structured interviews (N=20) to understand users' concerns about smartphone data privacy. We investigated three key areas: general user understanding and misconceptions, specific in-depth concerns, and mitigation strategies. We found that effective transparency and control are the central themes across all areas. Users are concerned about privacy issues negatively impacting their lives, especially through financial loss, physical harm, or manipulation. We show that privacy measures should be implemented with a stronger focus on the user by keeping the user in the loop through transparency and control.