This event was organized by the Nanoelec IRT program in collaboration with the excellence initiative program IDEX - Need for IoT. The success of the day was insured by the strong involvement of our industrial partners ST Microelectronics and CEA-LETI. The aim of the day was to increase awareness of the young future engineers of the impact of the microelectronic industry on the environment and society. A scenario of Gre2Phone (Green Grenoble Phone) prepared by our colleagues from Grenoble School of Management was set up and the students worked on the life cycle of a smartphone within several stages: raw materials, product development, manufacturing, usage and end-of-life of the product.