参考答案

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The chart above shows us a striking contrast of mobile-phone subscriptions between developing countries and developed countries. From 2000 to 2008, the mobile-phone subscription number of developing countries increased dramatically, while that of developed countries only had a slight increase. In 2000，the mobile-phone subscriptions of developing countries and developed countries were close to each other. However, the subscription number of developing countries was nearly four times that of developed countries in 2008.
There are many factors contributing to the above-mentioned phenomenon，but in general， they may come down to three major ones. To begin with, with the rapid improvement of people's living standards in developing countries，more and more people can afford a mobile phone, which has become a necessity in their life. What's more，the mobile-phone service in developing countries is becoming cheaper and cheaper，making mobile phones become increasingly popular. What is also worth mentioning here is that the population of developing countries is far larger than that of developed countries, which means there is a greater demand for mobile phones in developing countries.
To conclude, the mobile-phone service is a promising business and it will have greater development, especially in developing countries. Taking all these factors into account, I may reasonably predict that the present situation will continue for quite a while in the forthcoming years.