Mobile devices are reason of great concern for governments, they have a great computational capability, huge memories to store our personal data, GPS to follow our movements and are equipped with a camera and microphone to increase our experience in mobility. The UK Government has decided to ban iPads from the Cabinet over foreign eavesdropper fears, it has been requested Ministers to leave mobile in lead-lined boxes to avoid foreign governments to spy on top level government meetings. Mobile devices in government environments concerns the secret service of any states, cyber espionage more often exploits the mobile platforms.
Source: https://thehackernews.com/2013/11/smartphones-perfect-cyber-espionage.html