Making Mobile Networks Cheap and Green

VNL of Sweden unveils a solar-powered base station for the cellular industry that is a fraction of the size and cost of conventional towers
An African migrant talks with his family on a mobile phone handed to him by a Spanish journalist outside at the CETI, Short Stay Immigrant Center Marco Di Lauro/Getty Images

It has taken 21 years to get mobile phones into the hands of 3 billion people around the world. Reaching the next 1.5 billion, who live in the world's poorest and most remote corners, is expected to take a lot less time but will pose much tougher challenges.

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