If they have mobiles they
 will be keep chatting
 in mobiles and they will not study.
1 5 1
if u like this plz mark has best.
Disadvantages of mobile phones:
• Mobile phones can cause radiation, which is very harmful for our body.
• It can make your brain empty and dull.
• The serious road accidents have been caused due to mobile phones. 
• Decreases social interaction amongst families and friends.
• The study shows that mobile phones can also cause tumors.
bhavya you can add these points to the answer you have provided