One of the researchers who constructed the device hopes it will have long-term implications for technology: "Being able to keep mobile devices working for longer or do away with batteries completely by tapping into the stray energy that is all around us is an exciting concept. ... We hope that we have brought this technology closer to viability."
Although, the Nokia-Queen Mary University device isn't the only that uses sound waves to charge phones.
In 2011, British mobile phone company Orange tested a T-shirt that uses a similar method to convert sound waves to electricity intended to charge phones.
Another device, developed by uBeam, uses the reverse method to charge phones by converting electricity into sound and transmitting it to a cell phone.
All these devices are in varying stages of development. There's no word when, if ever, they will be available to consumers.