National Security Agency whistleblower Edward Snowden has come up with a concept iPhone case that could prevent the government from finding your location.

Smartphones, while incredibly useful, are also the “perfect tracking device,” Snowden wrote in a co-authored paper that covers his research.

Governments can monitor a user’s location through the radio signals from the phone and this can put journalists, activists, and rights workers in danger, he warned.

On Thursday, Snowden and hacker Andrew Huang presented a possible solution. It’s called “the introspection engine,” and it’s designed to alert the user if and when the phone’s radio signals are turned on.

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Edward Snowden has developed an iPhone case meant to kill surveillance