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How smartphones became the main weapon in the war, and why the deputies decided to ban them The Russian soldier looks at his phone, sitting in a tank in front of a parade in honor of the 75th anniversary of the lifting of the blockade of Leningrad during the Second World War, in St. Petersburg, Russia, January 27, 2019. Photo: Anton Vaganov / Reuters / Scanpix / Leta One of the most important types of equipment used in the modern war was a smartphone.