Call the official *Settings* app from my app on iPhone

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As noted in the comments below, this is no longer possible in iOS version 5.1 and after.

If you are on iOS 5.0, the following applies:

This is now possible in iOS 5 using the ‘prefs:’ url scheme. It works from a web page or from an app.

example urls:

prefs:root=General
prefs:root=General&path=Network

sample usage:

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General"]]
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General&path=Network"]]

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