Regardless of what you think of the guy, you have to admit: in this day and age, this is certainly something to consider using.
An excerpt from The Free Thought Project: This device will act as a kill switch that would pull the phone’s power supply when it detected radio transmitting after the owner has attempted to turn it off. As Snowden points out, Airplane mode is often ineffective at preventing such communications interception.
While the device is still far from ready for commercial distribution, Snowden and Huang note that they hope this case study will influence how individuals perceive their personal tracking devices they carry around in their pockets — also known as cell phones.
“Over the coming year, we hope to prototype and verify the introspection engine’s abilities,” they write. “As the project is run largely through volunteer efforts on a shoestring budget, it will proceed at a pace reflecting the practical limitations of donated time.”