Conspiracy Clinic
Chaplin's Time Traveler: Is This Woman In A Movie From 1928 Speaking On A Cell Phone?
Charlie Chaplin Time traveller?
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:
Pocket Ear Trumpet fromt he 1920s
Image taken from http://www.phisick.com/a7et82lutz.htm