FliphoneBochur So I just found and got in contact with a guy who knows how this works, and he said that this phone has 2 software versions. (Exact same model, but slightly different software.) The one with the older software version automatically gives you the option for the built-in mouse on installed apps, and the new one doesn't. Furthermore, the reason why the mouse didn't work on some of the apps I had installed later was that it doesn't give you the option for modified apps.