Vivo S1 is the first smartphone in the company's new S-series. It is priced at Rs. 17,990 for the 4GB RAM +128GB ROM variant. The 6GB RAM + 64GB ROM variant will sell at Rs. 18,990; whereas the flagship Vivo S1 handset has been priced at Rs. 19,990 and offers 6GB Ram + 128GB internal storage.br The Vivo S1 is backed by a MediaTek Helio P65 chipset and will compete with Realme X, OPPO K3, Redmi Note 7 Pro, and other sub 20K smartphones in the Indian market. Let's find out how the frst S-series smrtphone from Vivo performed in our first impressions.