The biggest question that appears to have escaped the Irish idiot is if it is a mobile phone it must be some kind of "time phone" who is she going to talk to with no cell towers or infrastructure around? Hence it's not a phone at all.
I've already given an explanation on phone/cell masts.
Also his theory would suggest that there are time machines in existence right now or in the near future, and whilst I cannot 100% disprove this I personally believe that Human technology has not reached the point at which anyone could time travel yet, not for a good many decades at least or at least until the singularity.
I'd go along with this.
Further to that point, if it were a time traveler why have we not seen more of this in other films or photos?
You probably have. However, in the last decade, if we'd seen (or filmed) someone on a mobile phone, you wouldn't have thought twice about it. Using a mobile phone does not mean you are from the future.
Why go through the hassle of wearing period clothing and then talk on a mobile phone?
It could be that she was caught out by the camera. If I were time travelling to 1928, I would be confident that I wasn't going to be filmed while walking on the street, so would feel quite confident to walk down the street, talking on a communication device. If anybody heard me, they would assume that I was talking to myself and/or was mad. The thought of me being a time traveller and using an advance communication device would be the last thing anybody from 1928 would think.
She was obviously careless though and should not have been caught on camera.
The fact that the person is old also casts doubt on the situation, if there were a singular time traveler (as we have not seen more) then surely he didn't simultaneously create a time machine and a completely unnecessary "time phone" in his basement.
Just because she is the only time traveller, which we have seen so far, does not mean that there haven't been 100s of 1000s of time jumps made by others.
The only reason why she is suspected of being a time traveller, is because she might be using a communication device. Had she been in any other point on the planet, at that given moment in time, she probably wouldn't have been filmed and nobody would ever known about her existence.
His claims of showing it to 100 people who could not offer one explanation as to what it could be only further strengthens the stereotype of stupid Irish people.
Just because somebody has an outlandish theory which does not conform to public (or your) opinion does not make that person stupid.
When inventors began to invent flying vehicles, people like yourself would've called them stupid. 100 years later, we now know that they were geniuses and in fact those who debunked those inventions were the stupid ones.
There are many more plausible theories to garner from that section of film, the least likely and least logical being that he/she is a time traveler.
Agreed 100%.