Oppo A91

Oppo A91
(Oppo F15 in India)
Brand	OPPO
Type	Smartphone
Series	A/F
First released	A91: December 20, 2019; 6 years ago; F15: January 16, 2020; 6 years ago
Predecessor	Oppo A9 2020; Oppo F11
Successor	Oppo A92; Oppo F17
Related	Oppo A31 (2020)
Compatible networks	GSM, 3G, 4G (LTE)
Form factor	Slate
Colors	A91: Lightening Black, Unicorn White, Blazing Blue, Red; F15: Lightening Black, Unicorn White
Dimensions	160.2×73.3×7.9 mm (6.31×2.89×0.31 in)
Weight	172 g (6 oz)
Operating system	Original: Android 9 Pie + ColorOS 6.1; Current: Android 11 + ColorOS 11.1
System-on-chip	MediaTek MT6771V Helio P70 (12 nm)
CPU	Octa-core (4×2.1 GHz Cortex-A73 & 4×2 GHz Cortex-A53)
GPU	Mali-G72 MP3
Memory	4/8 GB LPDDR4X
Storage	128 GB UFS 2.1
Removable storage	microSDXC up to 256 GB
SIM	Dual SIM (Nano-SIM)
Battery	Non-removable, Li-Po 4015 mAh
Charging	20 W fast charging; VOOC 3.0
Rear camera	48 MP, f/1.8, 26 mm (wide), 1/2", 0.8 μm, PDAF + 8 MP, f/2.3, 119° (ultrawide), 1/4", 1.12 μm + 2 MP, f/2.4 (B/W) 1/5", 1.75 μm + 2 MP, f/2.4, (depth sensor); LED flash, HDR, panorama; Video: 1080p@30fps, gyro-EIS
Front camera	16 MP, f/2.0, 26 mm (wide), 1/3.06", 1 μm; HDR; Video: 1080p@30fps
Display	AMOLED, 6.4", 2400 × 1080 (FHD+), 20:9, 408 ppi
Sound	Mono sound
Connectivity	USB-C 2.0, 3.5 mm Audio, Bluetooth 4.2 (A2DP, LE), NFC (A91), FM radio, Wi-Fi 802.11 a/b/g/n/ac (dual-band, Wi-Fi Direct), GPS, A-GPS, GLONASS, BeiDou
Other	Fingerprint sensor (under-display, optical), proximity, accelerometer, gyroscope, compass, magnetometer

The Oppo A91 is a mid-range smartphone developed by OPPO, part of the A series. It was introduced on December 20, 2019 in China, alongside the Oppo A8 until its release on December 26, 2019. On January 16, 2020, the smartphone was presented under the name Oppo F15 in India.

Specifications

Design

The screen is made of Corning Gorilla Glass 5, while the frame and back panel are made of glossy plastic.

The bottom houses the USB-C port, speaker, microphone, and 3.5 mm audio jack, while the top only contains a second microphone. The left side features the volume buttons and a slot for 2 SIM cards and a microSD memory card up to 256 GB. The lock button is located on the right side.

The Oppo A91 was sold in 4 colors: Lightening Black, Unicorn White, Blazing Blue, and Red. The Oppo F15 was sold only in the first two mentioned colors.

Processor

The Oppo A91 is powered by a MediaTek Helio P70 processor with a Mali-G72 MP3 graphics processor.

Battery & Charging

The battery has a capacity of 4025 mAh and supports 20 W VOOC 3.0 fast charging, which takes about 30 mins to reach 50%.

Cameras

The Oppo A91 features a quad main camera consisting of a 48 MP wide-angle lens with an f/1.8 aperture, Anti-Shake technology phase autofocus, an 8 MP ultrawide lens with f/2.2 aperture, and a black-and-white lens and depth sensor, both 2 MP with f/2.4 aperture. The device also features a 16 MP wide-angle front camera with f/2.0 aperture. Both the main and front cameras can record video at 1080p@30fps.

Display

The display is a 6.4" AMOLED panel with Full HD+ resolution (2400 × 1080), 408 ppi pixel density, a 20:9 aspect ratio, and a waterdrop notch for the front camera. An optical fingerprint scanner is also built under the display.

Memory

The A91 was only sold in 128GB of internal storage and 4GB/8GB of RAM configurations.

Software

The smartphone was released running ColorOS 6.1 based on Android 9 Pie and was later updated to ColorOS 11.1 based on Android 11.

References

↑ "Oppo A91 and A8 debut with MediaTek chipsets, ColorOS 6.1 and affordable pricing". GSMArena.com. Archived from the original on January 17, 2021. Retrieved 2021-01-19.
1 2 Valiyathara, Anvinraj (2019-12-20). "OPPO A91 launched in China for 1,999 Yuan (~$285); Specifications and price". Gizmochina. Retrieved 2026-02-28.
↑ "Oppo F15 debuts: 6.4" AMOLED, Helio P70 and four cameras". GSMArena.com. Archived from the original on March 13, 2021. Retrieved 2021-01-19.
↑ "Oppo A91 - Full phone specifications". www.gsmarena.com. Archived from the original on January 15, 2021. Retrieved 2021-01-19.
↑ "Oppo A91 review - Aiming for Awesome | Hitech Century". 2020-04-06. Retrieved 2026-02-28.
↑ "OPPO A91: The Sub $500 Smartphone Tech Spec-tacle | OPPO Australia". OPPO. Retrieved 2026-02-28.
↑ "Oppo Reno 2Z, Oppo Reno 3A, and Oppo A91 Getting Android 11 Update". Gadgets 360. Archived from the original on 2025-07-12. Retrieved 2026-02-28.

[1] "Oppo A91 and A8 debut with MediaTek chipsets, ColorOS 6.1 and affordable pricing". GSMArena.com. Archived from the original on January 17, 2021. Retrieved 2021-01-19.

[:0-2] 1 2 Valiyathara, Anvinraj (2019-12-20). "OPPO A91 launched in China for 1,999 Yuan (~$285); Specifications and price". Gizmochina. Retrieved 2026-02-28.

[3] "Oppo F15 debuts: 6.4" AMOLED, Helio P70 and four cameras". GSMArena.com. Archived from the original on March 13, 2021. Retrieved 2021-01-19.

[4] "Oppo A91 - Full phone specifications". www.gsmarena.com. Archived from the original on January 15, 2021. Retrieved 2021-01-19.

[5] "Oppo A91 review - Aiming for Awesome | Hitech Century". 2020-04-06. Retrieved 2026-02-28.

[6] "OPPO A91: The Sub $500 Smartphone Tech Spec-tacle | OPPO Australia". OPPO. Retrieved 2026-02-28.

[7] "Oppo Reno 2Z, Oppo Reno 3A, and Oppo A91 Getting Android 11 Update". Gadgets 360. Archived from the original on 2025-07-12. Retrieved 2026-02-28.