Real time traveler caught on 1928 film?

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European film maker George Clarke says:

"This short film is about a piece of footage I found behind the scenes in Charlie Chaplins film 'The Circus'. Attending the premiere at Manns Chinese Theatre in Hollywood, CA - the scene shows a large woman dressed in black with a hat hiding most of her face, with what can only be described as a mobile phone device - talking as she walks alone.

I have studied this film for over a year now - showing it to over 100 people and at a film festival, yet no-one can give any explanation as to what she is doing.

My only theory - as well as many others - is simple... a time traveler on a mobile phone. See for yourself and feel free to leave a comment on your own explanation or thoughts about it."

Real or not, what do you guys think? (Fast forward to 2:40 for the shot)