Good to see el Reg living up to it's famed journalistic integrity... Reporting on what the telegraph said that GCHQ said, rather than bothering to read the report.
On mobile phones, they ACTUALLY said :
“Mobile working offers great business benefit but exposes the organisation to risks that will be challenging to manage. Mobile working extends the corporate security boundary to the user’s location. It is advisable for organisations to establish risk-based policies and procedures that cover all types of mobile devices and flexible working if they are to effectively manage the risks.”