In December 2003, the wireless service provider Tu-Ka announced the TS41 — the world’s first mobile phone conducting sound through the user’s bone. Now the hard of hearing and people in high noise conditions can hear signals more effectively than with a conventional phone.
The TS41 uses both a standard speaker, which sends vibration through the air to the eardrum, and osseous conduction, which sends sound vibration through bone directly to the auditory organ. You just hold the phone to the bony areas around the ear to pick up direct transmission of the signal. People with hearing aids should not place the phone directly on their devices to avoid interference.
The phone will be of particular benefit to many people with hearing impairment and to those who use a mobile phone in noise-filled environments.