Heat Powered Phone: London designer, P Hyland has developed a phone that recharges using the heat. The Nokia E-Cu's case is copper-based with engraved heatsinks in a dry earth pattern and its embedded thermogenerator converts heat from any source into energy to recharge the phone.
Winding Power: This one comes from designers Yeon Kyeong & Mieong Kang; its quite simple, a few good twists are all that's needed to recharge and you are ready to go.
Spinning Power: It's a concept gadget designed by Song Teaho & Hyejin Lee; according to them, all you need to do is rotate the gadget approximately 130 times before you can make enough energy to make a 2-minute call.
Solar Powered Phone: To recharge this one, all you need to do is let it absorb light.
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