- OPPO F31 Series, The Durable Champion, includes 360° Armour Body, multi-layer “Airbag” design and equalisation membrane that balances internal and external pressures
OPPO India is set to launch its latest F-series smartphone, the OPPO F31, on 15th September 2025 bringing rugged durability and premium design together like never before. Built to withstand India’s toughest conditions and certified by 7 Military Standard (MIL-STD-810H-2022) it combines a 360° Armour Body, a multi-layer “Airbag” design, an equalisation membrane that balances internal and external pressures, Aerospace-grade Aluminium Alloy frame (AM04) and a 7000mAh five-year durable battery which that lasts twice as standard batteries.
Durability That Matches Real Life
According to a July-August 2025 Counterpoint survey, 79% of Indian consumers rank durability among the most important factors when buying a smartphone. In fact, more than half admitted to dropping their phone regularly, and 85% said they often use their device with wet or greasy hands. OPPO has engineered the F31 Series to take on everyday accidents and extreme conditions alike.
With triple IP certification – IP66 for dust and water resistance, IP68 to resist submersion in water up to 1.5 metres, and IP69 to withstand high-pressure jets up to 80°C. OPPO lab tests further validate the F31 series against 18 real-world liquids, including tea, coffee, juice, soapy water, and even hot spring water.
It features sealed microphones with a water-resistant breathable film, watertight SIM trays moulded with liquid silicone and reinforced sealing ribs, and an Equalisation Membrane that lets air flow while blocking liquids and dust. This prevents pressure build-up during sudden temperature changes or water exposure from straining seals or forcing liquid into weak points working like a raincoat with microscopic pores to deliver true all-directional waterproofing champion.
Additionally, it also boasts a Speaker Drainage system that emits a unique, pulsating sound to drain any trapped water from the speaker after submersion or exposure to liquids, ensuring clear audio. This built-in feature is part of the phone’s overall advanced liquid resistance, which protects against a variety of liquids, not just water.
360° Armour Body with Military Standards
Accidental drops remain a top concern for consumers, with 57% admitting to frequently dropping their phones and nearly 8 in 10 (79%) ranking durability as a top factor when choosing a new device. OPPO, the most preferred brand for water and dust resistance*, has subjected its F31 series to 7 Military Standard (MIL-STD-810H-2022) tests including extreme heat, freezing water, dust, sand and shock. Additionally, OPPO’s 360° Armour Body is designed to put those worries to rest by combining flagship-grade materials and internal shock absorption structures to deliver true all-around protection. The OPPO F31 Series can withstand drops from up to 1.8 metres, ensuring peace of mind for users who frequently handle their phones in crowded streets, marketplaces, and while traveling.
At the heart of this durability is a multi-layer “Airbag” design that protects critical components like the camera, speakers, battery, and vibration motors shielded with foam and silicone pads, acting as miniature shock absorbers. Ensuring impact energy is absorbed on collision, safeguarding delicate internals. With foam padding creates a buffer zone during drops, reducing the risk of cracks or separation.
Externally, the F31 is reinforced with diamond-like corner protection and a raised-lens design that ensures the screen and camera survive face-first impacts.
The frame uses Aerospace-grade Aluminium Alloy (AM04) that delivers 10% greater strength than its predecessor. This is the same class of alloy widely trusted in high-precision applications such as civil aircraft wings. For the display, the OPPO F31 features AGC DT-Star D+ glass on front, delivering enhanced resistance against scratches and everyday wear for long-lasting clarity and durability
The survey also revealed that 76% of users believe smartphones built for durability often compromise on design and appearance. OPPO’s new F31 Series challenges that perception, combining rugged build quality with a design that looks and feels unmistakably flagship while staying slim, ergonomic, and easy to hold.
OPPO F31 Pro+ will be available in Gemstone Blue, Himalayan White and Festival Pink. Each variant features a premium glass finish showcasing OPPO’s signature Glow process for a shimmering effect. Gemstone Blue in a feather-light 195g, 7.7mm build, while Himalayan White and Festival Pink balance slim ergonomics at 204g and 7.86mm. Up front, a 6.8-inch flat AMOLED display with a 93.5% screen-to-body ratio ensures immersive visuals, while a textured camera deco module with anti-fingerprint coating keeps the look clean.
OPPO F31 Pro takes on an understated, elegant aesthetic in Desert Gold and Space Grey. Desert Gold glimmers with faint golden filaments inspired by sand dunes, while Space Grey offers a warm, velvety-smooth texture. Measuring just 7.96mm thin and weighing 191g and 190g respective, it sports a 6.57-inch 2D curved AMOLED display with a 93% screen-to-body ratio.
Completing the line-up, the OPPO F31 pushes bold design boundaries with Midnight Blue, Cloud Green, and Bloom Red. Midnight Blue reflects cosmic light shifts, Cloud Green evokes a shimmer inspired by lunar trails, and Bloom Red with laser-engraved petal textures. Despite their artistry, each weighing 187g, measures 7.96mm slim, and comes with a 6.57-inch flat AMOLED display and under-display optical fingerprint scanner.
Battery That Lasts Five Years
With battery longevity ranking as the top priority for durability seekers (Counterpoint), OPPO F31 Series delivers a 7000mAh battery. With 80W SuperVOOC Flash Charge, the F31 Series provides hours of usage in minutes, while features like reverse charging and bypass charging add flexibility for modern, heavy users.
OPPO is the only smartphone brand in the industry to feature five-year durable battery one charge powers through the day, and one battery lasts for five years. At the core of this breakthrough is OPPO’s independently developed bio-inspired self-repairing electrolyte technology, paired with a high-performance graphite cell. This innovation works by continuously repairing the protective SEI film inside the battery during every charge and discharge cycle, preventing the anode and cathode from degrading over time. This delivers up to 1,830 effective charge cycles, with 80% capacity still intact even after five years of daily use.
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