The Sony Xperia XZ Premium is easily one of if not the most expensive flagships this year, at least for now. But if, for a moment, you ignore that price tag, you're actually left with a rather competitive high end smartphone with a very high-end screen. One of the very few, perhaps only two, 4K smartphone screens in the market. But for performance and battery life reasons, Sony doesn't make full use of that UHD screen all the time. But if you think it's well worth the consequences, you can easily force the Xperia XZ Premium to use that high density setting all the time with these relatively simple steps.