OPPO A 6x 4G vs Samsung Galaxy S25 Ultra
Our Verdict: The Samsung Galaxy S25 Ultra has the better camera on paper, 200MP versus 13MP, plus a 12MP selfie camera against 5MP, and the S25 Ultra supports 5G while the OPPO A 6x 4G tops out at 4G. The A5 2020 6x 4G has the bigger battery of the two, 6500mAh against 5000mAh, which should mean longer between charges in day-to-day use, and storage goes higher on the S25 Ultra, up to 1TB against 128GB. Only pay up for the S25 Ultra if you'll use what it offers; if not, the A5 2020 6x 4G makes more sense.
Over a full contract, the A5 2020 6x 4G works out around £257 all-in, about £583 less than the S25 Ultra.
6 reviews 4.4
12 reviews
Prices updated 27 July 2026
OPPO A 6x 4G
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Samsung Galaxy S25 Ultra
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|---|---|---|
| Expert Rating | 4.0 6 reviews |
4.4 12 reviews |
| Screen | 6.75" | 6.8" |
| Display | IPS LCD | Dynamic LTPO AMOLED 2X |
| Resolution | 720 x 1570 | 1440 x 3120 |
| Pixels Per Inch | 256 | 505 |
| Rear Camera | 13 Megapixels | 200 Megapixels |
| Front Camera | 5 Megapixels | 12 Megapixels |
| Chipset | Qualcomm SM6225 Snapdragon 685 (6 nm) | Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm) |
| Battery | 6,500 mAh | 5,000 mAh |
| Storage | 128GB | 256GB, 512GB, 1TB |
| OS | Android | Android 15 |
| SIM Type | Nano SIM | nano-SIM and e-SIM |
| Connectivity | Up to 4G | Up to 5G |
| Wi-Fi | 802.11 a/b/g/n/ac | 802.11 a/b/g/n/ac/6e/7 |
| Bluetooth | 5.0 with A2DP, LE, apt-X | 5.3, A2DP, LE |
| Dimensions | 166.6 x 78.5 x 8.6 mm | 162.8 x 77.6 x 8.2 mm |
| Weight | 210 grams | 219 grams |
| Water Resistance | IP64 dust tight and water resistant (water splashes) | IP68 - Dust and water resistant over 1.5 meter and 30 minutes |
| Contracts |
£8.99/mo
£9.00 upfront |
£33.79/mo
£29.00 upfront |
| SIM-free | £117.00 | £569.99 |
| Prices updated 27 July 2026 | ||
| Deals | Deals | |
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Frequently Asked Questions
Is the OPPO A 6x 4G or Samsung Galaxy S25 Ultra cheaper on contract?
Based on total cost of ownership, the OPPO A 6x 4G is cheaper on contract at £257.16 over the life of the deal from £8.99 per month with £9.00 upfront.
Which has the better screen, the OPPO A 6x 4G or Samsung Galaxy S25 Ultra?
Both phones have a similar screen size at around 6.8", the Samsung Galaxy S25 Ultra has the sharper display at 505 pixels per inch versus 256, and the OPPO A 6x 4G uses a IPS LCD panel while the Samsung Galaxy S25 Ultra has a Dynamic LTPO AMOLED 2X.
Which has the better camera, the OPPO A 6x 4G or Samsung Galaxy S25 Ultra?
The OPPO A 6x 4G features a 13 Megapixels rear camera, while the Samsung Galaxy S25 Ultra has a 200 Megapixels rear camera. Both devices also have front-facing cameras for selfies and video calls.
Which is cheaper to buy SIM-free, the OPPO A 6x 4G or Samsung Galaxy S25 Ultra?
The OPPO A 6x 4G is cheaper SIM-free, starting from £117.00.
What storage options are available for the OPPO A 6x 4G and Samsung Galaxy S25 Ultra?
The OPPO A 6x 4G is available in 128GB, while the Samsung Galaxy S25 Ultra comes in 256GB, 512GB, 1TB.
What processors do the OPPO A 6x 4G and Samsung Galaxy S25 Ultra use?
The OPPO A 6x 4G is powered by the Qualcomm SM6225 Snapdragon 685 (6 nm), while the Samsung Galaxy S25 Ultra uses the Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm).
Which is easier to carry and hold, the OPPO A 6x 4G or Samsung Galaxy S25 Ultra?
It's a trade-off: the OPPO A 6x 4G is lighter but the Samsung Galaxy S25 Ultra is more compact. It's 9g lighter at 210 grams, though the Samsung Galaxy S25 Ultra is actually the more compact phone at 162.8 x 77.6 x 8.2 mm, the Samsung Galaxy S25 Ultra is slimmer at 8.2mm thick.
Which is more water resistant, the OPPO A 6x 4G or Samsung Galaxy S25 Ultra?
The OPPO A 6x 4G is rated IP64 dust tight and water resistant (water splashes), while the Samsung Galaxy S25 Ultra is rated IP68 - Dust and water resistant over 1.5 meter and 30 minutes.
What operating system do the OPPO A 6x 4G and Samsung Galaxy S25 Ultra run?
The OPPO A 6x 4G runs Android and the Samsung Galaxy S25 Ultra runs Android 15. This is one of the biggest factors when choosing between the two, as each ecosystem has its own apps, services and features.