I can say that break times at school are thoroughly boring. If I was allowed to bring my Ipad and play on it, I definitely would. It wouldn't hurt other people's feelings, just makes them want a phone. If they are allowed to take it out when in class is a different matter.
Their are some parents that will let their child have a phone @ a certain age. As a former student in middle school I do not have a phone yet, but some of my friends do so sometimes I feel left out. I honestly think that if a teacher lets you get out your device in class I sugest not to get it out, because it would hurt others feelings.