Vivo smartphones are usually sleek and well designed, and this one is no exception. The Vivo S1 sports a 6.38-inch display with a tiny dewdrop-style notch at the top. Vivo has opted for an AMOLED panel, and the Vivo S1 sports an in-display fingerprint scanner. The display has thin bezels on the sides but the bottom chin is comparatively thicker.
The Vivo S1 is available in two colours, Diamond Black and Skyline Blue and we had the Diamond Black unit for this review. It has a laminate back with a striking diamond pattern design and a gradient colour finish. Depending on how the light hits the back panel, the diamond patterns emerge, which does look catchy.
The Vivo S1 is the first smartphone in India to be powered by the new MediaTek Helio P65 SoC. The Helio P65 is a mid-range processor based on a 12nm process. It has a pair of ARM Cortex-A75 cores clocked at 2GHz, and six Cortex-A55 cores clocked at 1.7GHz. For graphics, it has a Mali-G52 integrated GPU.
The Vivo S1 is a dual-SIM device and has two Nano-SIM slots as well as a dedicated microSD card slot. Connectivity options on the Vivo S1 include Bluetooth 5, dual-band Wi-Fi, GPS, FM radio, dual 4G VoLTE, and the usual sensors. The Vivo S1 packs in a 4500mAh battery and you get an 18W fast charger in the box.
The MediaTek Helio P65 SoC powering the Vivo S1 does a good job and you won’t notice lag or stutter doing day-to-day tasks. This smartphone is quick to launch apps and can run most apps and games out there on the Google Play Store. We never had to wait too long for an app to open. It also manages idle battery drain well, and in our experience, the Vivo S1 did not lose too much of its charge when sitting idle. Multitasking was quite easy considering we had the 6GB RAM variant of the device. The phone never really had to close apps running in the background.
Video recording maxes out at 1080p for both the primary as well as the selfie cameras. We found that the Vivo S1 lacked video stabilisation, which is a little surprising considering its price. Most smartphones at this price are capable of recording 4K video and can stabilise 1080p footage.