Michael Gartenberg – Installed Base of Music Capable Phones Gartenberg has a graph showing the growth in the hand held media device market. The fastest growing segment going forward would appear to be music capable mobile phones. As a proud owner of the AudioVox SMT 5600 I will tell you this is a much better strategy than for me to have to carry both an mp3 player AND a phone. It also has the added benefit of turning my music off for me and switching to phone m mode when calls come in and I can talk on the same headphones that I was listening to my mp3s on. Now why would anyone want anything different?