We explore the hidden impacts of smartphone use through The LAST Phone, an interactive experience that reveals the real-time ecological and human costs behind our devices. Using machine learning and projection, the project makes invisible systems visible—tracing how everyday phone interactions connect to global networks of mineral extraction, labor, and environmental impact. Expanding on this, the project highlights how expansive systems of exploitation underpin the mobile devices we use every day. While focusing on the extraction and impact of four critical minerals, it also points to the broader network of human and natural resources involved. Each smartphone becomes a lens into a complex, often invisible chain of mining, manufacturing, and distribution that shapes our relationship with technology.