Microsoft has recently released the preview of phone reports on Power BI Mobile. Just like the phone optimization for dashboards, you can now create report views that are optimized for your phone. They detailed this new feature in a blog post yesterday discussing the authoring process and more.
With the new phone-optimized reports feature, you can now specifically tailor a portrait view of your existing report on Power BI Desktop for mobile viewers. Once you publish your report to the Power BI service, the phone optimized report will be available to all mobile users on any screen size. All of the scaling and resizing is handled automatically. On top of the custom view, they have now included a variety of features to enhance and optimize the experience of using reports on phones. Also with phone reports, you can minimize the slicer to show a minimal number of values.
Read about this feature in detail here.