Oppo F31 series debuted in the Indian market on Monday. The new smartphone lineup includes the Oppo F31 5G, Oppo F31 Pro 5G, and the Oppo F31 Pro+ 5G. The standard and the Pro model sport 6.5-inch AMOLED displays with a 120Hz refresh rate. Whereas the Oppo F31 Pro+ 5G features a larger, 6.8-inch AMOLED display.Oppo F31 series debuted in the Indian market on Monday. The new smartphone lineup includes the Oppo F31 5G, Oppo F31 Pro 5G, and the Oppo F31 Pro+ 5G. The standard and the Pro model sport 6.5-inch AMOLED displays with a 120Hz refresh rate. Whereas the Oppo F31 Pro+ 5G features a larger, 6.8-inch AMOLED display.