So having a partial ban on their usage i.e., phones being allowed once the classes are over, is the right course of action.
Cell phones have undeniably become a fundamental part of everyday life.
Cell phones also facilitate research work and writing of projects by facilitating access to the internet.
Thus, it encourages students to complete their assignments and do extra reading.
It is also seen that students use text-messaging to exchange jokes or notes during the class, which too can distract them from their studies. These days some students use their cell phones for cheating during exams.
There have been incidents in the past wherein students called up the school authorities, and lied about bomb threats just to avoid attending lectures.
If the kids want their parents immediate advice on anything, be it on some study-related topic or some personal issue, they can always call up their parents.
Cell phones are beneficial in today's times when both the parents are working long hours.
On the other hand, school authorities often feel that cell phones disrupt learning, and should hence, be banned.
In fact, many state governments have passed legislation according to which cell phones are banned in schools, but can be used outside, triggering the debate.