A smartphone smuggled out of North Korea has revealed the astonishing levels of control the secretive dictatorship is exercising over its people.

The phone, which from the outside appears no different from a normal device, issued warnings about using South Korean slang words to users, and auto-corrected “South Korea” to read “puppet state,” an investigation from the BBC found.

It would also covertly take a screenshot every five minutes, storing the images in a secret folder which the user couldn’t access, but which presumably were accessible to North Korean authorities.

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