The vivo S1 is now available for purchase in India through Amazon.in and vivo's eStore. The smartphone will also be sold through Flipkart, but the listing there is yet to appear. You can also buy the phone from offline stores if you prefer to check it out before forking over the cash. The vivo S1 comes in three memory versions - 4GB/128GB, 6GB/64GB, and 6GB/128GB. Only the base model is currently available for INR17,990 ($255/€225). The top-end model costs INR19,990 ($280/€250) and you will have to shell out INR18,990 ($270/€240) for the 6GB/64GB variant. vivo S1 in Diamond Black...