I can get the mouse to work with my phone just fine; attach it through a simple adapter. Clicks register, movement registers - but I have to guess where the click will land, because there's no cursor.
How can I get the phone to display the mouse cursor?
It's pretty simple if you're using Android 4.0 or later. Just go to Settings > Developer Options > Show Pointer location (or Show touches, whichever works) and toggle that on.
Note: If you don't see the developer options, you need to go to Settings > About Phone and tap on Build number several times.
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