This is Xiaomi first smartphone with an android operating system, xiaomi has been doing a great job when it comes to make an budget oriented smartphone and this is one of them . The Mi Os is quite heavy Os which sometimes makes the smartphone lagy, but as xiomi came up with android one it have done a best anyone can do . This device has a massive HD display with a metal body design and the highlighting feature is the dual camera which is a cherry on the top . With the stock Android Os the Mi A1 performs amazingly fast and the camera quality is way good as compared at this price segment .