You aready can
A "cordless" kettle has to be placed on a special base. Funny because I can simply drop my Z1 Compact onto a special base just the same. In fact "charging bases" exist for the whole Xperia Z line up. In the past I had something similar for a Nokia 6310i. So to answer your question mobile phones can be more like a cordless kettle, that yours is not is down to the choice you made when you purchased the device, just like you can still buy corded kettles.