It took about 20 years for the first billion mobile phones to sell worldwide. The second billion sold on four years, and the third billion sold in two. 80% of the world populiation lives within range of a cellular network, which is double the level in 2000. Among other cellphone manufacturers, Nokia wants to own a big chunk of the next billion of handsets. The New York Times Magazine sent a reporter to follow anthropologist employed by Nokia who is scouting the world to see how people use their cell phone. He founds out that the ownership of a communication device such as a cellphone is becoming almost as essential as the access to running water or a sewage system. And in many instances, through amazing grassroots innovations, cellphones can help to reduce poverty. Read this great story in the NY Times Magazine.