According the website the model number is G3221. In this device Sony use a MediaTek CPU (MTK Hello P20) model MT6757 and Mali-T880 GPU, which is the highest performing and most energy-efficient mobile GPUs in the Mali family. In the memory unit, Sony use 4GB of RAM with 64GB of internal storage. For selfie lover it has a 16MP of front facing camera and 23MP Rear camera. The device also supports a Full HD Display with the resolution of 1920 x 1080 .
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Source : techupdate3