According to an article in mobileindustry.biz (this article) mobile in Japan is booming !!
“According to the report, partially translated by GameSpot, figures released by the Ministry of Internal Affairs of Communication state that the mobile industry has grown to 722.4 billion Yen (4.9 billion Euro) over the past 12 months - a rise of 39 per cent.
The increase was boosted by mobile content sales, which rose by 21 per cent to reach 315 billion Yen (2.1 billion Euro). Sales of ringtones accounted for 161 billion Yen (1.09 billion Euro).”