The au Design Project x Yamaha from KDDI show a series of phones that double as musical instruments. Designed by a foreign and Japanese team of young innovators, these handsets are original, creative, and (the best part) actually able to make music, writes Trends in Japan.In My Pocket, above, is unique in that it comes with multiple accessories to create different instruments from the harmonica to the trumpet. Sounds are “hummed” into the handset (much like with Yamaha’s EZ TP Trumpet) with the rest controlled by the fingers.