John Cho says making 'Searching' has changed his "relationship with technology".

John Cho

John Cho

The 46-year-old actor plays a father trying to find his teenage daughter in the thriller movie - which is shot from the point-of-view of smartphones and computer screens - and John has admitted the filming experience has subsequently affected how he uses technology.

He said: "Making the movie increased my relationship with technology a little bit. I got familiar with things that I wasn't aware of."

John was shocked by some of the things he learned during the movie's shoot.

And he was constantly asking questions of director Aneesh Chaganty, who was having to reassure him that the themes of the film were true to modern-day life.

John told Den of Geek: "The thing I was very aggressive with Aneesh was making sure that everything was plausible. Coming in I was a bit of a luddite and I was very suspicious that a person could lean on a computer that much. I'm a person who thinks of a computer as a second resort, not a first resort.

"As an example, I said 'do people text on computers?' Because I use my phone to text. And Aneesh very gently said 'everyone does it except you, John', and I was assured of that. And now I prefer to do my texting on my laptop."