Smart Brain is a Cellnex service which guarantees access to urban infrastructures by standardizing the data gathered from various sources. It comprises a modular design IT infrastructure with open standards and a series of cloud applications guaranteeing and enabling data exchange, allowing it to be used simultaneously by different users with different profiles (citizens, public authorities, social interest groups, distributors, developers, etc.). This makes it the ideal tool to promote participation and do-it-yourself services for citizens, while also enhancing interaction with public authorities with speed and transparency.