The required cell population that must be targeted (killed or controlled) to cure or control cancer, is the set of all malignant cells that could evolve.

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Some 80% of Jamaica's population has a cell phone, up from 9% in 2001.

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Developed countries generally have more cell phones than people, and countries like China, India and the Philippines are rapidly following suit with 75%, 77% and 92% of the population respectively having cell phones.

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"I don't think about Slim every day, " says O'Brien, who claims he has taken 20% of the market in El Salvador in one year. (Slim, in turn, has bought a cell phone company in Jamaica, setting up a battle on O'Brien's home turf.) O'Brien is also eyeing the U.S., where only 80% of the population has a cell phone.

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Cameron Kerry, general counsel of the Department of Commerce, pointed out that 93 percent of the population in the U.S. now have cell phones, and that smartphones will eclipse early generation cell phones by 2011.

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At the same time, only 12% of the population have a formal bank account, while almost half of them own a cell phone.

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