Phones should not be in Schools?

I think that phones should not be for children because they are not mature enough.

For example So If they get angry they might chuck there phone away and then that will be a waste of money.

Also they might be talking to others when they are not supposed to be in learning time.

For example Like some people used to go on a website called quizup.com it is a website that people used to talk to each other in learning time.

And they might go on something rude and they will not be allowed to look at.

So if they watch something rude but they try to joke around with some people they might not take it as a joke then they will tell the teacher.

For example like when they are trying to be funny they might go overboard and do something rude.