The document describes D3Mobile, an international school championship for scientific experimentation using mobile phones. Students take photos of objects with their phone cameras and use free software to create 3D models. There are three tests of increasing difficulty involving 3D modeling, metric measurements, and geo-referencing. Participants learn skills in 3D modeling, measurement, and including 3D figures in digital documents. Over 1000 students from 33 countries participated in the 2015 competition. The document outlines the benefits of the competition for developing students' skills with an accessible technology.