E-Cu cell phone has no charger. To convert the heat energy, the handset utilizes a tool called thermogenerator. The back was full of copper that can convert heat into electrical energy. So simply put into the owners pocket, the phone automatically collects body heat and turn it into energy. And Voila, the phone battery to be charged again.
It seems interesting if this concept phone is really realized. But not explained whether the Nokia E-Cu can be shocked by the user so many layers of conductor. Users whose hands easily sweat may be more careful.