Vivo revealed another great mid-ranger, that is Vivo S1 4 GB. On unboxing, you can see an advanced gadget with 6.38 inch super AMOLED screen. On the front there is the 32 MP AI selfie camera that offers astonishing images. In terms of security, the In-Display Fingerprint is also present. There is a Helio P65 processor that offers advanced processing capabilities. The battery timing is also good with the 4,500 mAh capacity.