You can't just look at units sold, you have to look at net units sold because the version of the product existed.
For example, if 5.9 million of those 6 million people would have bought the larger iPhone model anyway, then you didn't actually gain much by offering the Mini unit.
For example, if 5.9 million of those 6 million people would have bought the larger iPhone model anyway, then you didn't actually gain much by offering the Mini unit.
I have no idea what those numbers are, though.