Usage of Mobile in school/ college by the students is important?

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Usage of mobile phones has been increased rapidly. Now we can see the mobile phones in the hand of almost all the students. In school/ college I think usage of mobile phone must be restricted. We also finished our school/ college without mobile phones. Now everybody thinks that without mobile it is not possible to maintain communication with friends and family. And now most of students are going to downwards or mixing up with bad people due to this easy mobile communication, cause their parents have no no control over the usage of the mobile phone of their Kids. I want to know the opinion of the mylot users' about the subject line.