A scene from the extras available on the DVD of Charlie Chaplin's The Circus shows a woman walking to the premiere of the film, holding her hand to her ear and speaking to what looks like a mobile phone. Take a look at the video. What is she holding? Is that really a mobile phone way back in 1920s? Is she a time traveller? Then the phone has to be an iPhone 4! Click here for a HD version of the video above.