Oppo A78 4G official Pictures. Oppo A78 4G is a Smartphone of oppo. The Oppo A78 4G Android Smartphone. Announced Jul 2023. Features 6.43″ Display Snapdragon 680 4G Chipset 5000 MAh Battery 256 GB Storage 8 GB RAM Corning Gorilla Glass 5. Oppo A78 4G price starts.