Bringing cellphones in school: good or bad?

Many students are getting addicted on texting and cell phones, they also do this even inside the classroom. They put their attention in their cell phones instead of listening to their teacher while discussing. They don’t only disturb the teacher but their classmates as well. And beside this, they also distract the teacher while discussing. They are becoming a hindrance for those students who want to learn, they bother someone who is willing to get knowledge, they are doing such thing that will make them suffer in the near future and because of what they do, some will also suffer the same fate. The price we get from doing such nonsense things is so terrible. A thing not used on the correct way will surely lead into no good.  What will you feel if your cell phone ringed because someone not important sent you nonsense message at the middle of the discussion, knowing that you disturb the whole class? Is that what you call a useful technology? I'll say, harmful, destructive and monster instead of useful. In the other side, we all know what a cell phone can  give us; it makes communication easy, fast and reliable. It is also handy, we can put it in our pocket or bag, and it is done not to be a destructive gadget, it is invented to make people’s life easy. But if it is not used the proper way, who knows what destructive things it can do