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Leave the Phone at Home: Covert Tracking and Surveillance in Modern Apps Smartphones have become indispensable tools for communication, navigation, banking, and entertainment.  Yet beneath their convenience lies a complex and often poorly understood ecosystem of data collection.  Many apps quietly gather far more information than users realise, creating detailed behavioural profiles that can be used for advertising, analytics, and sometimes surveillance. The phrase “leave the phone at home” captures a growing concern: in certain contexts, a smartphone is not just a device—it is a tracking beacon. This article explores how covert tracking works in mobile apps, what data is collected, who uses it, and why it matters. The Hidden Economy of App Data Most free apps are not truly free.  Instead, they are funded through data-driven business models, primarily advertising technology but also data collection.  To serve targeted ads, apps and their partners need to collect exte...