presentation about cell phone

Our topic is about cell phone. Our presentation is for Chinese student. Mobile phone is necessary and useful to live in Japan. Life without mobile phone is inconvenient. I suggest that you have mobile phone if you want to live in Japan comfortably. Chinese mobile phone is very expensive. Most Chinese think of it as so rich tool because if Chinese buy mobile phone, they have to pay almost of salary in month. Surely Japanese one are also expensive but Japanese are cheaper than Chinese. Moreover, Function is better than Chinese, for example function of camera is better than Chinese. Japanese mobile phone can take a picture like digital camera. Japanese can also watch TV. I want to give one advice for Chinese students. There are some difference between Chinese and Japanese. One of them is the way to pay charge. You know the way to pay in Chinese is prepaid card, but Japanese is charged directly to bank account every month. Although Chinese is advance payment, Japanese is not like Chinese.