iPhone and iPod touch: Applications unexpectedly quit after entering some specific Japanese characters.
Matter
When entering some specific characters using the Kana keyboard on an iPhone or iPod touch, the application in use unexpectedly quits.
Resolution
Reset Keyboard Dictionary, then restart the device.
References
To resolve this issue, update to iPhone OS 3.1.3 or later.
No, it still remains. Whether my iPhone 3GS is already 3.1.3, it goes down with entering at least "あ", "こ", "さ" and "。". Having done operations above to resolve this issue.