The iPhone does not have the Mouse feature available by default. To turn it on, on the iPhone go to:
Settings | Accessibility | Touch | Assistive Touch
And turn on Assistive Touch. You will now see a mouse cursor on the iPhone and will be able to control it.
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I have heard from users that my App is complicated to install. Installing Screen Mirror is like installing new hardware, has procedure, and can go wrong. The app does work; please get in touch if you have any trouble. I am continuously updating my help pages please let me know about issues you face.