Display size: 6.5 inch AMOLED capacitive
Memory: 4GB RAM, 128GB internal
Rear Camera: 12MP + 2MP + 2MP
CPU: Octa-Core Processor
OS: ColorOS 6.1, based on Android 9
Oppo A31 features 4GB RAM, 128GB internal memory expandable up to 256GB, Dual SIM (nano+nano) dual-standby (4G+4G), ColorOS 6.1 operating system based on Android Pie v9.0 with 2.3GHz Mediatek P35 Octa-core processor, IMG GE8320 GPU. 4230 mAH lithium-polymer battery providing talk-time of 45 hours and standby time of 450 hours.