Why It Can't Be A Cellphone

One of my favorite episodes ever of Torchwood is the one where the creepy couple shows up at carnivals all throughout time. Seriously, I just got chills right now thinking about that episode. If I could remember the name of it I would tell you all to go watch it this Halloween weekend. Anyway, all over the internet, people are talking about this Charlie Chaplin video and how some person on there looks like they are talking on a cell phone. We think they are on one because it is what we are trained to see and feel because we are thinking about now.

Let us say I am wrong though and it is a time traveler. Fine. Time traveler is in the background of a Charlie Chaplin movie and has a cell phone up to their ear. Who exactly are they talking to? The reason I ask that is because unless that time traveler took a whole bunch of cell phone towers back in time with them, they are not going to be making any phone calls.