Doubt that the government would go to the expense of policing these cards. I was going through immigration the other day and ,despite signs and maybe even a video running about not using mobile phones, I stopped counting at 60 people in line who were on their phones and without a care. Sure , majority were Asian ( who don't give a toss about regulations ,would claim that they don't speak English and therefore do not understand what a circle with a bar over a picture of a mobile phone means) but, one was a Qantas captain in the crew line .
All under the noses of the immigration staff and not a word said, not a fine dispensed. Do you really think that they will travel out to airports around the country and conduct raids?