Depends on which devices you really do not want to support. What are your criteria? Big screen? In this case you can add
<supports-screens android:largeScreens="false" />
To the AndroidManifest.xml file. But actually it depends on what you are trying to block here. There is a thin line between the tablet and the phone - they work with the same OS and have the same capabilities as the ability to make phone calls. Think about which function you want to use as a criterion, and then find the value you want to use in the manifest file.
This whole answer is nonsense, I just keep it here for Dianna's comment, because it is the only voice of reason here. Bottom line - the tablet is an ordinary Android device, it will work with the same software.
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