My opinion.

I think a cell phone is use full but it has various problems. First, a cell phone can use anywhere but it can’t to use in a hospital, train, airplane, bus, concert hall, and movie theater. Second, a cell phone put out electric waves. It has a bad influence of pace maker. It is very danger and terrible. Electric wave is bad influence of growing. Almost all young have a cell phone. A cell phone change the lifestyle to all most people. A cell phone is necessary article now. The cell phone has various problems though it is convenient.