Nokia recently announced that they want to patent a “piezoelectric kinetic energy harvester”, a way to capture energy from the phone’s movements. This may remind you of the kinetic wristwatches, based on the same principles and generating clean energy.
Nokia’s technology allows the heavy internal components to move on rails within the device, as part of a “force-transferring assembly”. The forces and acceleration will be put to good use, generating energy and powering the future handsets, maybe even replacing traditional chargers.
Below you can see the schematics of the technology, if you’re curious.