Game-Changing Handsets From Mobile World Congress

Solar-powered devices were a big hit at this year's Mobile World Congress, with Samsung, LG and ZTE all touting phones that can be charged by the sun. In Samsung's case, the Blue Earth is an eco-friendly device made by PCM materials derived from recycled plastic water bottles. The phone offers an economy mode to increase efficiency and includes a solar panel where an hour of sunlight results in 15 minutes of talk time. The Blue Earth can adjust screen brightness, the backlight and Bluetooth connectivity to save juice, and features a built-in pedometer that tells the user how much in CO2 emissions they saved by walking instead of driving.

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