Vivo recently launched the Vivo Z1 Pro (Review) in India and priced it quite nicely. This smartphone were able to fare quite well whenever we reviewed it. Now, the Chinese manufacturer has launched one more smartphone priced only a little higher, dubbed the Vivo S1. That is clearly a section of the brand new S series which stands for Style. The Vivo S1 is stylish for certain, but is there the performance to back its looks? We test that to find out.