"There are now over 6 billion cell phone subscriptions in the world and cell phone penetration in developing countries is over 80 percent. There are more cell phones out there in the world than there are toothbrushes!
However, there are 600 million people with cell phones that have no access to electricity. To charge cell phones, people often have to walk hours to charging stations where they can plug their phone into a car battery. While kerosene may be a very poor lighting source, it is a source of light. For cell phone charging, there is often no local option.
Simply put, charging cell phones is emerging as the the number one reason people with no electricity want solar energy."
GIGAOM
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