Android: How to check why an app is "Not Compatible"

My app is targeting API/minSDKversion 5 and runs fine on 2.2. My friend just tried to do开发者_StackOverflowwnload my app onto his Samsung Galaxy S2 running 2.3.4 but was met with the "not compatible" warning. Is there some way I can see why my app is not compatible?

The same problem I have resolved using <supports-screen> and <compatible-screen> tags in AndroidManifest.xml, also sometimes it make sense to check tag

<uses-feature android:name="android.hardware.telephony" android:required="true"/>

since some tablets don't have telephony

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