Hi, I just downloaded and installed Iphone sdk 3.0. The strange thing is that "Iphone sdk" is not selectable in the choice during installation. Then I had to click every Iphone related package to install more. After installation, I got the error message of certification failure when I tried to compile a program (a basic empty project which should run). I know that this is because the compilation is for an Iphone release. But there should be target for IPhone simulator. Why I can't see it in my XCode environment? I have been tortured 2 days by the IDE. My friend said that his older version of Iphone SDK works well. Is this because I used newest version of sdk? Can anyone help me? Thanks!