Oppo A91 Oppo A91 APPLY NOW! OverviewSpecificationsReviewsThe phone comes with a 6.40-inch touchscreen display with a resolution of 1080×2400 pixels. Oppo A91 is powered by an octa-core processor. It comes with 8GB of RAM. The Oppo A91 runs Android 9 and is powered by a 4000mAh non-removable battery.