蜜芽传媒

Edward Snowden is the former National Security Agency (NSA) analyst responsible for the biggest leak of top-secret intelligence documents the world has ever seen. He claims that programmes known as 'smurfs' were used to infiltrate targeted phones by US intelligence.

Edward Snowden explains his theories on how 'smurfs' can take over a person's smartphone, and reveal personal information about those devices and their owners.

Picture: Smartphone courtesy of Thinkstock