SAGAWIN123 is not just the trust we place in network infrastructure but also our willingness to trade bits of personal data for access to online services that renders us vulnerable. Caught between the ruse and exploit, we find ourselves subject to ever more sophisticated forms of profiling, both online and off. Yet if algorithmically generated data-bodies are our future, they are also prone to error. FALSE POSITIVE deploys text messaging, stealth infrastructure, street intervention, and data visualization to enact a surveillance conspiracy engaging the public in an intimate, techno-political conversation with the mobile technologies on which they depend.