From what I understand by using code like this:
NSURL* appUrl = [NSURL URLWithString: @\"URL\"]; [[UIApplication sharedApplication] openURL:appUrl]; <
NSURL* appUrl = [NSURL URLWithString: @\"URL\"]; [[UIApplication sharedApplication] openURL:appUrl];
You can use this on iOS 5.0 and later:
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs://"]];