Allowing students to carry cell phones gives parents the ability to contact their children whenever necessary. This can include during family emergencies or when a student may need to arrange a different method of getting home. Likewise, students can contact their parents to arrange a ride home when ill, or they can request a forgotten book or project be brought to the school.
With most smartphones featuring a fully featured Web browser, the potential for cheating has grown exponentially. Clever students can subtly look up the answers to test questions using search engines such as Google or online encyclopedias such as Wikipedia. While careful monitoring often eliminates this issue, the potential for mischief is still considerable.
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Advantage- students can study in the spare time and can also contact their parents without troubling the school authority(but in the spare time pls)
disadvantage-they can cheat, disturb everyone by having sudden calls and even play games in studying time.