The current time travel craze
There are a lot of people that would be going, “OMG, a time traveller!!1!”
My answer: Meh.
Perhaps a prescient prop manager. Maybe a director with an eye towards the future. Time travel, in this case, is unlikely.
Why? Well, a cellphone is not the only part of the cell network. Take a cell phone back to 1920, even with a charger, and you are looking at a fancy flashlight. There are no cell towers in 1920, no interconnects with the normal phone system. Heck the tone system of dialing didn’t even come into play until 1963. In other words, and cellphone would be a relatively useless piece of anachronistic junk when the video was made. It would be as likely that the woman was an alien and contacting her mothership.