While I am against illegal jamming, I am also against assholes. The woman on the phone can only be described this way. If I were a judge and the case came before me, I would dismiss all charges against the Australian lady and fine the other woman the maximum amount allowable by law. It isn't that difficult to turn off a phone or silence it in a theater. It's also the polite and proper thing to do. Anyone who refuses to do so should be asked to leave. Anyone who refuses to leave after being asked should be arrested.
IMHO, there should be a standard "courtesy-area" signal which would instruct suitably-configured phones to turn off audible ringers; once such a thing became common, anyone whose phone sounded off in an area where the signal was in use would be subject to public disdian.
The signal would not block receipt of text messages, nor prevent emergency (or other) outgoing calls (though someone who made outgoing calls discourteously would not be looked upon kindly). It would, however, help people who intend to be courteous to actually do so.
"While I am against illegal jamming, I am also against assholes."
hmm - considering the movie under discussion, you might want to rephrase that, lol.