Vivo S1 is available in 2 color variants - Diamond Black & Skyline Blue.
Yes, Vivo S1 has a dedicated MicroSD card slot. You can use 2 sim cards and a memory card at the same time.
Vivo S1 offers superb value for money. The mobile has almost everything which you should have in an ideal mobile. However, we feel that the following can be disadvantaged.
However, the phone does offer full HD video recording and also offers fast charging via MicroUSB port but we still feel that above could be of good help to users.
Yes, Vivo India does provide a complimentary protective case inside the Vivo S1 standard packaging.