Why cant a 12 year or 13 year student cant use a mobile ??

Expert proposal, children under the age of 12 less best with or without mobile phones. For more than 12 years old with children for mobile phones, parents should be more attention to two points. First, the mobile phone function don't dazzle too flowery, can guarantee basic calls, send text messages can be. Mobile phone function too much, the child, on the one hand, easy to form bandwagon psychology, on the other hand, easy to indulge in complicated function of excessive playing games and listening to music, etc. Second, the children using mobile phone time should be limited.
The expert reminds: children use mobile phones can cause memory loss.
Scientists warn that children use mobile phones can cause memory loss, sleep disorders and other health problems.
So,you had better not use mobile phones