The Oppo F31 slots into OPPO’s popular F Series as a durability-first mid-ranger, arriving in India with a launch price of around ₹24,999. Announced on 17 September 2025 and released ten days later, it leans on a headline-grabbing combination of a huge 7000mAh Si/C battery, a rugged IP68/IP69 and MIL-STD-810H rated body, and a smooth 120Hz AMOLED panel — a mix that is unusual at this price point.
Rather than chasing flagship silicon, the F31 (model CPH2781) targets buyers who want all-day endurance and everyday resilience without overspending. This article breaks down what those specifications mean in practice, where the phone makes sensible trade-offs, and who should consider it over the crowded field of sub-₹25,000 Android phones.
Full Specifications
Network
| Technology: | GSM / HSPA / LTE / 5G |
| 2G bands: | GSM 850 / 900 / 1800 / 1900 |
| 3G bands: | HSDPA 900 / 2100 |
| 4G bands: | 1, 3, 5, 8, 19, 28, 38, 40, 41, 42, 48 |
| 5G bands: | 1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA |
| Speed: | HSPA, LTE, 5G |
Launch
| Announced: | 2025, September 17 |
| Status: | Available. Released 2025, September 27 |
Body
| Dimensions: | 158.2 x 75 x 8 mm (6.23 x 2.95 x 0.31 in) |
| Weight: | 185 g (6.53 oz) |
| SIM: | Nano-SIM + Nano-SIM |
| IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) MIL-STD-810H compliant* * does not guarantee ruggedness or use in extreme conditions |
Display
| Type: | AMOLED, 1B colors, 120Hz, 600 nits (typ), 1400 nits (HBM) |
| Size: | 6.57 inches, 105.0 cm2 (~88.5% screen-to-body ratio) |
| Resolution: | 1080 x 2372 pixels (~397 ppi density) |
| Protection: | AGC DT-Star D+ |
Platform
| OS: | Android 15, ColorOS 15 |
| Chipset: | Mediatek Dimensity 6300 (6 nm) |
| CPU: | Octa-core (2×2.4 GHz Cortex-A76 & 6×2.0 GHz Cortex-A55) |
| GPU: | Mali-G57 MC2 |
Memory
| Card slot: | microSDXC |
| Internal: | 128GB 8GB RAM, 256GB 8GB RAM |
| UFS 2.2 |
Main Camera
| Dual: | 50 MP, f/1.8, (wide), PDAF Auxiliary lens |
| Features: | LED flash, HDR, panorama |
| Video: | 1080p@30/60/120fps |
Selfie camera
| Single: | 16 MP, f/2.4, (wide) |
| Features: | Panorama |
| Video: | 1080p@30fps |
Sound
| Loudspeaker: | Yes, with stereo speakers |
| 3.5mm jack: | No |
Comms
| WLAN: | Wi-Fi 802.11 a/b/g/n/ac, dual-band |
| Bluetooth: | 5.4, A2DP, LE, aptX HD |
| Positioning: | GPS, GALILEO, GLONASS, BDS, QZSS |
| NFC: | No |
| Radio: | Unspecified |
| USB: | USB Type-C 2.0, OTG |
Features
| Sensors: | Fingerprint (under display, optical), accelerometer, proximity, compass |
Battery
| Type: | Si/C Li-Ion 7000 mAh |
| Charging: | 80W wired, 33W PPS, 13.5W PD Reverse wired charging |
Misc
| Colors: | Midnight Blue, Bloom Red, Cloud Green |
| Models: | CPH2781 |
| SAR: | 1.18 W/kg (head) 0.81 W/kg (body) |
| Price: | ₹ 24,999 |
Price and Availability
The Oppo F31 offers a compelling combination of features and performance. While the base price is around ₹24,999, the actual cost may vary depending on your location and retailer. Below, you’ll find the approximate price of the Oppo F31 converted into various currencies. Please note that these are estimates based on recent exchange rates as of July 1, 2026 and may not reflect the exact price you’ll find at a retailer.
- United States: $264
- Japan: ¥42,905
- United Kingdom: £199
- Australia: A$383
- Canada: C$376
- Taiwan: NT$8,408
- Denmark: kr1.727
- Saudi Arabia: ﷼990
- South Korea: ₩408,881
- Germany: €232
- Brazil: R$1.367
- Vietnam: ₫6.914.355
- Kenya: KSh 34,166
- India: ₹24,999
- Indonesia: Rp 4.733.874
- Nigeria: ₦363,433
- Pakistan: ₨73,440
- Philippines: ₱16,210
- Bangladesh: ৳৩২,৫৩৮
Value: What ₹24,999 Actually Gets You
At roughly ₹24,999, the Oppo F31 competes in one of the most contested segments of the Indian market. The value story here is not raw processing power but a bundle of features that usually appear one or two at a time: a 7000mAh battery, 80W fast charging, dual IP68/IP69 protection, and a bright AMOLED screen. For shoppers who prioritise battery life and build quality over benchmark scores, that package is compelling. Buyers chasing the fastest chipset or the most versatile camera system may still find stronger options nearby, so it pays to weigh which features matter most to you.
Design and Durability
Measuring 158.2 x 75 x 8 mm and weighing 185 g, the F31 stays reasonably compact and light considering the oversized battery inside. The standout element is protection: OPPO markets IP68 and IP69 ratings, meaning the phone is dust tight and can withstand high-pressure water jets as well as immersion up to 1.5m for 30 minutes, alongside MIL-STD-810H compliance. OPPO notes this does not guarantee ruggedness in extreme conditions, so treat it as everyday peace of mind rather than a licence for abuse. Three colours — Midnight Blue, Bloom Red and Cloud Green — round out the design choices.
Display Quality
The 6.57-inch AMOLED display runs at 1080 x 2372 pixels (about 397 ppi) with a 120Hz refresh rate for fluid scrolling. Brightness is rated at 600 nits typical and up to 1400 nits in high-brightness mode, which should keep content readable outdoors, while a claimed ~88.5% screen-to-body ratio and AGC DT-Star D+ glass add to the premium feel. With 1 billion colours and a high refresh rate, it is a strong panel for video, social media and general use in this price bracket.
Performance and Memory
Power comes from MediaTek’s Dimensity 6300 (6 nm), an octa-core chip with two Cortex-A76 cores at 2.4 GHz and six Cortex-A55 cores at 2.0 GHz, paired with a Mali-G57 MC2 GPU. This is an efficiency-focused platform rather than a gaming powerhouse, so expect smooth everyday performance and light gaming rather than sustained high-end titles at maximum settings. Memory options include 128GB and 256GB configurations, both with 8GB RAM on UFS 2.2 storage, and a microSDXC slot allows further expansion.
Camera Capabilities
The rear setup is a dual system led by a 50 MP f/1.8 wide sensor with PDAF, accompanied by an auxiliary lens, plus LED flash, HDR and panorama support. Video tops out at 1080p up to 120fps. On the front, a 16 MP f/2.4 camera handles selfies and video calls at 1080p@30fps. This is a practical, daylight-friendly camera arrangement aimed at social sharing rather than professional-grade versatility, so keep expectations realistic in low light.
Battery and Charging
Battery life is the F31’s biggest selling point. The 7000mAh Si/C Li-Ion cell is well above the segment average and should comfortably deliver multi-day use for lighter users or a very long single day for heavy ones. Charging is handled by 80W wired fast charging, with 33W PPS and 13.5W PD support, plus reverse wired charging to top up accessories. Actual charging times and endurance vary with usage, but on paper this is one of the strongest battery packages in its class.
Software and Connectivity
The F31 ships with Android 15 layered under ColorOS 15, giving it a modern, feature-rich interface. Connectivity covers 5G (SA/NSA) across a broad set of bands, dual-band Wi-Fi 5 (802.11 a/b/g/n/ac), Bluetooth 5.4 with aptX HD, and a wide range of positioning systems. Notable omissions are NFC and a 3.5mm headphone jack, and the USB Type-C port is limited to USB 2.0 speeds. Stereo speakers and an under-display optical fingerprint sensor complete the everyday feature set.
Who Should Buy the Oppo F31
The Oppo F31 is best suited to buyers who want exceptional battery life, reliable water and dust resistance, and a bright, smooth display without stretching past ₹25,000. It is a strong fit for students, frequent travellers and anyone who hates charging mid-day. Those who need NFC for contactless payments, the fastest possible chipset, or a more advanced multi-camera system should compare rivals closely, as the F31 trades some of those extras for endurance and durability.
Conclusion
The Oppo F31 makes a clear, focused pitch: massive 7000mAh endurance, rugged IP68/IP69 and MIL-STD-810H protection, and a fluid 120Hz AMOLED screen at an accessible mid-range price. Its efficient Dimensity 6300 chipset, capable 50 MP main camera and up-to-date ColorOS 15 software round out a well-balanced everyday phone, though the missing NFC, absent headphone jack and USB 2.0 port are worth noting. If long battery life and durability sit at the top of your list around ₹24,999, the F31 is an easy recommendation; if contactless payments, top-tier performance or camera versatility matter more, weigh it against close competitors before deciding. Confirm the latest pricing, variant availability and specifications with OPPO India or reputable retailers, as these details can change over time.
References
- OPPO India – OPPO F31 5G Specifications – Primary manufacturer specifications for the OPPO F31 5G, including model number, dimensions, display, cameras, chipset, battery, charging, network bands, SAR, connectivity, and OS.
- OPPO India – OPPO F31 5G Product Page – Official product overview for confirming marketed features such as 7000mAh battery, 80W SUPERVOOC charging, IP ratings, display claims, colors, and positioning.
- OPPO India – Latest Smartphone Models – Official OPPO India listing that confirms the OPPO F31 5G exists within the F Series lineup alongside F31 Pro and F31 Pro+ models.
- GSMArena (gsmarena.com) – Well-known smartphone specification reference useful for independent cross-checking of device specs, launch status, network bands, variants, and related models.
- The Times of India – Technology – Established news source covering the OPPO F31 series India launch, pricing, offers, features, and availability context.
