The W707 was never released as a commercial device. It was a Walkman-branded music-centric clamshell device with a circular, iPod-like, touch-sensitive dial on the front face of the phone.
In addition to the small colour screen on the outside of the device which could show the music track that was currently playing, there were also music control icons that lit up inside the circular dial. A circular clock face could also be displayed on this part of the phone.
This phone was used by the character known as Elvis in the James Bond film, Quantum of Solace.