Mobile telephone is so common nowadays that almost every student has got one.Using mobile telephone has an aspect of advantage and another aspect of disadvantage.
For the first aspect,using mobile telephone makes it easy to contact between parents and friends.Mobile telephone also adds much fun to our life.
For the later aspect,students' using mobile telephones in class will disturb the class.And as a student who doesn't have very much money,it is a waste to talk on phone and send messages.
So I suggest that please don't use mobile telephone in class if you have one and take care of the costly things of your own.