Finally, let all the people use the telephone to split time in search of forgotten anchor classes and other activities that are useful and do not look at the screen of mobile phone too.
Finally, ask each person to choose the right phone, remember to take time to study and do other things that are useful. And not a screen mobile phone, too.
Finally, ask everybody to choose the appropriate time in the phone don't forget learning and doing other activities useful. Mobile phone screen and do not look too.