Robots are going to do many things for us in the future, including charging our devices. Take the DockBot for instance: it is an autonomous smartphone charging robot with a speaker built-in that you can summon with a voice command or touch of a finger. It has charging pads and USB ports to charge your devices.
The DockBot comes with WiFi and Bluetooth connectivity. It has an auto summon feature. It fatures smart mapping and navigation to get around. The DockBot can provide over 5A of power to charge up to 4 devices simultaneously. You can find out more about it on Kickstarter.