This book explains why you see what you do on your phone, and how these devices shape our knowledge, conduct and representation of war in the 2020s. It shows why smartphones are indispensable in peace and wartime: every device is a potential weapon, lines blur between war and daily life, and conflict becomes a shared digital experience. Social media platforms displace state-controlled narratives, amplifying violence and shaping war's legitimacy. Apps democratise conflict, enabling anyone to identify and attack perceived enemies. As the Ukraine war has shown, this new reality involves complex, unevenly distributed infrastructures, merging civilian communication with military targeting. With war accelerating beyond our comprehension, militaries have raced to benefit from and adapt to the smartphone age. Matthew Ford explores critical questions about today's hyper-connected battlefield.