as every body knows, mobiles are playing a important part in our daily life nowadays.but they have bot advantages and disadvtanges in my opinion.

　　first, mobiles make it convinent for people to keep in touch with each other whevere they are.especially when they have something important.it reduces the cost for people dont have to travel a long way to get to know the things in person

　　second,we can send messages by mobiles with little money,just 0.01 yuan for each short message.

　　third, we can also play games or take photoes or listen to music on the mobiles,late we do many things on them with the development of technology.

　　but they also have many disadvatages.we have to pay for the wrong numbers which are not for us.the radioactivites may do harm to our health.sometimes the rings may affect others in public or at meetings