The number of mobile phone users worldwide soared to over 3.3 billion by the end of 2007, a total penetration rate of 49 percent.
Africa showed the greatest increase, and more than two-thirds of all cell phone subscribers now come from developing countries. Cell phones account for nearly 90 percent of all telephone use in Africa. India and China added 154 million and 143 million new subscribers respectively.
The global annual average growth rate for cell phone subscribers currently stands at 22 percent. However, subscriptions to mobile phone plans increased at a rate of 39 percent annually in Africa between 2005 and 2007, and the rate of increase in Asia over the same period was 28 percent.