Does not work the way you think it does. Its pretty much a gimmick. You can get other items to act as a speaker, like a Glass (a cup). Let me tell you, however - if its so loud around you that you can't hear by holding the phone to your head, or by using a speaker phone, this will NOT help you. Go for a $5 bluetooth headset.
Perhaps, perhaps not. It may allow one to hear a call in some circumstances when any other method is impossible. I'm thinking industrial locations, around machinery etc. It's not always feasible to have a bluetooth on.
Kyocera smart sonic receiver using tissue conduction is amazing!
I was reading through some of the comments people made comparing the smart sonic receiver to a Bluetooth headset or noise cancellation. Do some research before you start dismissing new technology as a gimmick. This tissue conduction technology actually was named by popular science magazine Nov 2012 issue as one the top inventions in 2012. Also, you may want actual hear it to really understand how it works. They showed it the May CTIA 2012 show in New Orleans and won a bunch of awards. Kyocera has actually launched several phones in Japan. Just check out the web for Kyocera tissue conduction for info. Or better yet when it comes out trying using in a loud environment. Just some food for thought before dismissing this as just some replacement ... (continues)