What are the rules around mobile phones in schools, and could Queensland bring about a blanket ban?

Currently individual schools have their own policies and rules on whether students can use mobile phones on school grounds. (ABC South West: Anthony Pancia)

Kids can check their phones up to 100 times a day — but making schools phone-free could cut the time they spend on them by 20 per cent, according to research. 

So why aren't we banning them in schools?