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I've been frustrated by the way we change the volume on the iPhone. The side button makes too large of a change, for my taste, with a single tap. But when I try to use the on-screen slider, I find I also have a hard time because my finger covers up the slider knob, so I can't see when I try to make small changes. I've discovered a way around this. If you put your finger on the slider knob and start to move it, you can then move your finger (keep it in contact with the screen) quite far away -- I move my finger up into the main screen area -- and the slider will still move. Now I can make the small changes I want and watch the slider knob move without my finger blocking my view.