There are nearly four billion mobile subscribers, more than half the world's population. New phones cost as little as USD$20 and require very little education or technical literacy to operate. And with users in developing countries now outnumbering those in the developed countries, development practitioners and social entrepreneurs are beginning to leverage the power of mobile technology to reach development objectives. Sophisticated devices and data services remain most accessible in the wealthiest countries, but usage in the developing world is significantly altering business and social behaviors around the world.
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