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Not new but fascinating
Why would a time traveller do this in front of everyone - surely it would create unwanted attention
How very spooky! 
But who were they calling? If they've travelled back in time, they'd be the only one with a mobile never mind that there wouldn't be any signal towers etc etc
Radio signalling was around then.
Time travellers could use it to connect devices
What am I saying . . . she's rubbing her ear and shouting at her hubby to hurry up.
If you want to find out the likely explanation look at the last part of the trivia page for The Circus on IMDB:
http://www.imdb.com/title/tt00.../trivia?ref_=tt_ql_2
Originally Posted by Cinds:
But who were they calling? If they've travelled back in time, they'd be the only one with a mobile never mind that there wouldn't be any signal towers etc etc
Maybe mobile phone signals can travel through time. They seem to in Dr Who 
Or maybe the hoaxer forgot about that 
Originally Posted by Saint:
Not new but fascinating
Why would a time traveller do this in front of everyone - surely it would create unwanted attention
Although it's just a bit of fun posting it I do like how people become engaged enough discuss the various aspects.
Originally Posted by El Loro:
The power of the search engine.
Originally Posted by Cinds:
But who were they calling? If they've travelled back in time, they'd be the only one with a mobile never mind that there wouldn't be any signal towers etc etc
Yes I think that even though there were methods of signal transmission, I doubt they would recognise a modern mobile phone, let alone being able to route signals.