It is undeniable that the telephone has become one of the most common electronic gadgets in many countries throughout the world. Some people are addicted to their phones and they stare at the screen every day, which leads to the overusing of phones. To conclude, the pros and cons of mobile phones depend on the way we use them. Be aware and use your phone wisely. 

But what I am saying is not entirely against the use of phones at school age. But I just want to tell you that: In life, doing everything needs to have a reasonable arrangement and separation of time, so that my work can be effective. So I urge you to read and ponder what I say so that you can have a reasonable way to use the phone without "harm".