The Xiaomi Redmi 3S Prime is nearly identical to the Redmi 3S, with some key differences. It bears 3GB of RAM and 32GB of inbuilt storage, while the Redmi 3S comes with 2GB of RAM and 16GB of inbuilt storage. The Redmi 3S Prime also bears a fingerprint sensor on the rear panel, the only other difference with its more basic, cheaper sibling.As for other specifications, Redmi 3S Prime sports a Qualcomm Snapdragon 430 octa-core SoC (four cores at 1.1GHz, four cores at 1.4GHz) alongside the Adreno 505 GPU. The smartphone sports a 5-inch HD (720×1280 pixels) IPS display and run MIUI 7.5 based on Android 6.0 Marshmallow.
The Redmi 3S Prime bears a 13-megapixel rear camera and a 5-megapixel front camera. The rear camera features PDAF (phase detection autofocus), an f/2.0 aperture, and LED flash. The smartphone supports expandable storage via microSD card (up to 128GB). Specifically, the Redmi 3S Prime sports a hybrid dual-SIM (Micro-SIM + Nano-SIM) slot with the second SIM slot also capable of functioning as a microSD slot. As for connectivity, the Redmi 3S Prime supports options 4G, Wi-Fi, GPRS/ EDGE, Bluetooth, GPS/ A-GPS, Bluetooth, Glonass, Wi-Fi 802.11 b/g/n, and Micro-USB. It bears a 4100mAh battery, and measures 139.3×69.6×8.5mm.