Oppo F31 5G

The Oppo F31 5G has a non-folding, non-rugged design measuring 158.2 mm tall, 75 mm wide, and 8 mm thick, with a total volume of 94.92 cm³ and a weight of 185 g. A notable aspect of its build is the IP68 ingress protection rating, which certifies it as waterproof and capable of withstanding submersion to a depth of 1.5 metres.

The Oppo F31 5G features a 6.57″ OLED/AMOLED touchscreen with a resolution of 1080 x 2372 px and a pixel density of 397 ppi, delivering a reasonably sharp image across its panel. The display runs at a 120Hz refresh rate with a 240Hz touch sampling rate, and reaches a typical brightness of 600 nits. It is covered by branded damage-resistant glass, though it does not support HDR10, HDR10+, or Dolby Vision, and there is no secondary screen.

The Oppo F31 5G is powered by the MediaTek Dimensity 6300, an octa-core SoC built on a 6 nm process with two cores clocked at 2.4 GHz and six at 2 GHz, supported by big.LITTLE architecture and Heterogeneous Multi-Processing for efficient workload distribution across 8 threads. It comes with 8 GB of LPDDR4 RAM running at 2133 MHz — with a maximum supported memory amount of 12 GB — alongside 256 GB of internal storage and a maximum memory bandwidth of 17.07 GB/s. Graphics are handled by the integrated Arm Mali-G57 MC2 GPU clocked at 950 MHz with DirectX 12 support, while the cache hierarchy consists of 512 KB L1, 1 MB L2, and 2 MB L3. In Geekbench 6, the chipset scores 782 in single-core and 2012 in multi-core testing, and the SoC also integrates LTE connectivity alongside 64-bit and multithreading support.

The Oppo F31 5G has a dual-lens rear camera system pairing a 50 MP primary sensor at f/1.8 with a 2 MP secondary lens at f/2.4, both using a CMOS sensor without back-side illumination or optical image stabilization. The main camera supports 4K video recording at 30 fps, continuous autofocus during video, phase-detection autofocus for stills, touch autofocus, slow-motion recording, timelapse, burst mode, HDR, and in-camera panoramas, while manual controls cover ISO, exposure, focus, and white balance — though manual shutter speed, RAW capture, 360° panorama, HDR10 recording, Dolby Vision recording, and 3D capture are not available. A single LED flash is present on the rear, but there is no dual-tone or RGB flash. On the front, a 16 MP single-lens camera with an f/2.4 aperture handles selfies without a dedicated flash, and the front camera is a standard placement with no under-display positioning.

The Oppo F31 5G runs Android 15, a free and open-source platform that supports multiple user accounts and includes a broad set of privacy controls — covering location access, camera and microphone permissions, clipboard warnings, and the ability to block app tracking, though cross-site tracking blocking and Mail Privacy Protection are not available. On the usability side, it offers dark mode, dynamic and manual theme customization, an extra dim mode, customizable notifications with a media picker, full-page scrolling screenshots, split-screen multitasking, Picture-in-Picture, widgets, sharing intents, a child lock, and the ability to offload apps or play games while they are still downloading. On-device machine learning is supported alongside offline voice recognition, voice commands, Live Text, and device position tracking, while focus modes, Wi-Fi password sharing, Quick Start, and PC mode are absent. OS updates are not delivered directly from the platform vendor.

The Oppo F31 5G houses a 7000 mAh rechargeable, non-removable battery with a battery level indicator included as standard. It supports 80W wired fast charging, and a charger is included in the box, though wireless charging and reverse wireless charging are not available.

The Oppo F31 5G features stereo speakers and supports aptX, aptX HD, and LDAC Bluetooth audio codecs, making it compatible with a range of higher-quality wireless audio workflows, though aptX Adaptive and aptX Lossless are not supported. There is no 3.5 mm headphone jack and no built-in radio.

The Oppo F31 5G supports 5G cellular connectivity alongside Wi-Fi 4 (802.11n) and Wi-Fi 5 (802.11ac), Bluetooth 5.4, and NFC, with a dual-SIM configuration and a maximum download speed of 3300 Mbit/s. It connects via a USB Type-C port running USB 2.0, though there is no HDMI output and no external memory slot. For navigation, the device includes GPS with Galileo support and a compass, while an accelerometer is also on board; however, a gyroscope, barometer, infrared sensor, heart rate monitor, and motion or optical tracking are all absent. Security is handled by a fingerprint scanner, with no iris scanner, 3D facial recognition, or stylus included, and features such as crash detection, satellite SOS, ANT+, DLNA certification, and a built-in projector are not present.

The Oppo F31 5G includes a video light for recording in low-light conditions, while its display is flat rather than curved and uses neither sapphire glass nor an e-paper panel.