The Phone ships with an Android lollipop fork called miui 7, which is has been reworked from the ground up compared to the earlier versions of miui, version 7 is certainly more likeable and better polished.It's still a single-layered interface, but it does let users costomise the look and feel the transiton effects and themes.The themes store app has a preety good selection of free themes and we particularly liked the marshmallow one.
