Very bad ? Memory, Storage & SIM: 6GB RAM, 128GB internal memory expandable up to 512GB | Dedicated Memory slot. "Hi Mukesh, Storage on M51 phones are expandable by additional 512GB, using micro-SD card. Hope this is of help. Regards, Samsung India"####[['bad', 'Overall#Overall', 'negative'], ['6GB RAM', 'Product Configuration#Operating Memory', 'neutral'], ['128GB internal memory', 'Product Configuration#Memory', 'neutral'], ['expandable up to 512GB', 'Product Configuration#Memory', 'neutral']]