The Samsung S7550 Blue Earth is an early example of a smartphone with an integrated solar panel made in 2009. Some of the first experiments with solar cells involved wireless voice communication; as early as the 1880s, it would take another 100 plus years to appear in a consumer device serving the same function.
One hour of full sunshine would provide approximately 5-10 minutes worth of talk time. The phone design is ecologically friendly as it uses recycled water bottles for its case. The phone integrated other green features like a pedometer. It reported how many trees worth CO2 were saved by walking instead of driving.
