Overview: A Northern Ireland filmmaker posts this bizarre video of a woman apparently talking into a cell phone on the streets in 1928. It becomes an internet sensation:

Now, obviously it isn't a cell phone and clearly the guy on Youtube said time traveler in the header because it is so strange... But what could it be?

Possible explanation:

It's an ear trumpet:

Image taken from http://www.phisick.com/a7et82lutz.htm