Now cell phone is the most important thing in our daily life. Almost all people all over the world use it, not only adults but also children. They will agree that cell phone is very effective or helpful for their business. But I thing cell phone is dangerous for children under the age of 12 years old. Why ? First, the feature of the cell phone for children are the same with adult,s. For example, the cell phone is completed with WAP. WAP is a technology that link device such as mobile phone to internet. By using this feature, the children can download adult website, like games, pornography, adult picture etc. It influences their attitude and behaviour. The second reason is that the children waste much money. They have to buy credit for their cell phone. Actually they can save their money for something useful like buy book, dictionary and their stationary. The third reason is that the effect of radiation from cell phone is dangerous for health. The use of cell phone for long time can trigger than growth of cencer cell, intefery with ear health, skin and brain. Because the children immune systems are still develope and more sensitive to many things, the radiation of the cll phone can attack them easily. That is why the parents should not give their children a cell phone although it makes them easy to communicate.