About a year ago Samsung released an 'Eco-friendly' phone with a solar-panel on the back called the 'Blue Earth'. This seemed like a great idea to me at the time, and I was expecting to see all mobile phones eventually coming out with solar-panels on the back cover, but for some reason this hasn't happened.

Now I'm pretty sure that like me, everyone hates having to charge their cell's battery, and simply leaving your mobile out in the sun for a few hours to charge it would be really convenient,especially seeing we live in a country with oodles of sunshine? So what is wrong with the technology? Perhaps someone can enlighten me as to why it hasn't been more widely adopted.