In a recent opinion, the European Data Protection Supervisor, Giovanni Butarelli, called for better EU-wide data protection relating to mobile health. Butarelli acknowledged the potential of mobile health for improving healthcare, but also highlighted the risks it poses for privacy and data protection. Butarelli appealed to the EU legislator to foster accountability of app designers and to encourage the application of privacy by design and by default. Butarelli announced that the Internet Privacy Engineering Network (IPEN) will be encouraged to test new best practices for mobile health and consider the global dimension of mobile health in order to reinforce cooperation between data protection authorities around the world.