I've just been having a little look at this 'time traveller' spotted in a Charlie Chaplin film. It definately looks like the person is speaking into something like a mobile phone and seeing as it's filmed in 1928 it throws up more questions than I can possibly think of or answer.
The more I watch this clip the creepier it gets.
So, while it's dark and rainy outside and if you have 8 minutes to spare take a look (ignoring the advertising ).