Use of the mobile phone among Japanese children

Japan has always been far ahead in mobile phone usage compared to Europe and US. Many innovative service started there and, in the world, Japanese people are the ones who spend more time in front of their phone display. An interesting article about mobile phone usage among Japanese children has been published here.
To me, the most interesting thing is the fact that almost 63% of the Japanese children use their phone to listen to music. I remember having seen more than one market research conducted in US and Europe, where most of the people preferred to have a second device to listen to their music instead of using their phone. The main reasons were limited memory capacity and audio quality. I've always liked he idea of having a single device for everything and I believe the tendency is the convergence of all services into a single device. I don't see why we have to carry around multiple devices when you can do everything with one. Well, if you think, the smartphones are gradually replacing PDAs. The same wil happen with media players. The cost of memory is dropping dramatically and phone manufacturers are realizing a good media player integrated into the phone is a good value to the customer. In this sense SE and Apple are doinga really good job.