iAd and iphone before 4g compatibility
<p>iAd seems to require iphone os 4.0, so I install the new beta ver xcode and sdk.
It works.</p>

<p>But The previous sdk disappear.
Now, the new build app (with iAd) is also retro compatible with 3.1.x? Or with iAd I have to renounce to retro compatibility?</p>
