in that time a mobile phone wouldn't even work as there are no sending/receiving towers for the signal nor operators... its really dumb =.= sorry to say but its another american conspiricy bullshit xD
What's more likely, she just happens to be holding her hand similarly to someone using a cellphone, or she's a time-traveller?
you can see she is holding a black piece of something. and how she acts you can see she isnt talking to someone else out of frame. use your imagination man if find this quite facinating
maybe she's just a freaking lunatic? talking to some1 who lives in her head and having her hand that way cause she isn't 100%?? i dunno, but 1 thing is for sure, no time traveler... if she would be, then their would be A LOT of examples of timetravelers... not just 1.... i suppose its just some random retard who just happened to have her hand like that while she talked to her "imaginary friend" or whatever...
Sensible and logical explaination? Okay, how's this: This woman simply appears, purely by coincidence, that she is talking on a cellphone. Just like someone in the middle ages holding their arm up to examine a mole on their wrist might appear, to us, as though he were checking his watch. The alternative, that she is somehow using a cellphone from the future, is so laughably ridiculous it doesn't even need a seconds consideration. Occam's Razor prevails as always.
It's called a Sonotone .. it was made back then for the people who couldn't hear so good .. it looks like a cellphone , newest technology back then .. just google Sonotone and you'll see .. and the reason why she was talking was "i think" talking to the director or someone out of the frame ..
Guess what I think it's a motorola phone. Oh & all you need is a mobile arial generator to comunicate. The only problem is we are in 1 of the many alternate paradigm, because the person in that footage came from another alternate reality. So hoping back is like guessing what radio station is the right one.