Do you think cellphones should be banned in schools and colleges?

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Do any of you think cellphones should be banned in schools and colleges?I think they shouldnt ban it atleast in colleges...In my case its very useful to know where my friends are,where is the next class,is there a change in a class or timetable etc...And since in a college,lots of extracurricular activities in which the whole of class will be involved and guys will not be alwasy together as in a school...So most of the times all co-ordination works happens thru cellphones...And my parents can call me at any time where ever Im...Most of us either switch it off before we enter a class or put it in silent.Most of the times its the teachers cellphones which rings while taking the class...I just cant understand why most of the colleges wants to ban it?I dont see any justifiable reason behind it...