My app has a link which user clicks on it, it will open iTunes settings in iPhone automatically.
Is there any API supporting this behavior? Please help.
If you are asking about openning the Settings App and navigating to iTunes in the Settings App then the answer is that Apple only allows an app to open the Settings App on the page that is specific for that app - you can't deep link in Settings anywhere else. (You used to be able to do that.) If you are asking how to open the iTunes App itself - I don't know.