The Samsung Galaxy S21 Ultra 5G is in our catalog but no UK retailer currently stocks it.
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All
Black
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Brown
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Storage
All
256GB
512GB
128GB
Photography-focused buyers hunting a refurbished flagship who want genuine 10x optical zoom and a huge high-resolution screen, and who can live without ongoing software updates.
£5 off any Samsung phone at Mozillion
Take £5 off any Samsung phone at Mozillion, code valid on pay monthly phone contracts and SIM free phones.
Terms: Valid on SIM free phones and pay monthly phone contracts.
Ends 31 Aug 2026
Grade Mobile
Cashback:
£0.00
Upfront Cost:
£179.00
Cashback:
£0.00
Upfront Cost:
£179.00
Cashback:
£0.00
Upfront Cost:
£179.00
Cashback:
£0.00
Upfront Cost:
£179.00
Cashback:
£0.00
Upfront Cost:
£179.00
Cashback:
£0.00
Upfront Cost:
£189.00
Cashback:
£0.00
Upfront Cost:
£189.00
Cashback:
£0.00
Upfront Cost:
£189.00
Cashback:
£0.00
Upfront Cost:
£189.00
Cashback:
£0.00
Upfront Cost:
£189.00
67 refurbished deals available - SIM-free from £179.00.
The Galaxy S21 Ultra 5G was Samsung's kitchen-sink flagship for 2021, and it is aged well enough to still be a sensible refurbished buy. The headline act is the camera array: rather than one long lens, you get two, a 3x telephoto and a separate 10x periscope, which means genuinely usable reach at both portrait distance and across a football pitch. That dual-zoom setup is still rare, and it is the main reason people hunt this phone down years later. The 6.8-inch QHD+ panel is enormous and can run its adaptive 120Hz refresh rate at full resolution, unlike the S20 Ultra before it. It was also the first non-Note Galaxy S to accept an S Pen, though the stylus is a separate purchase and there is nowhere on the phone to store it. The trade-offs are real: at 227g it is a genuinely heavy phone, Samsung removed the microSD slot, and the UK's Exynos 2100 chip runs warmer than the Snapdragon version sold elsewhere. Its update window has now closed, so treat it as a camera-led bargain rather than a long-term phone.
Tracking the best prices since 27 Apr 2026.
| Feature | Samsung Galaxy S21 Ultra 5G | Samsung Galaxy S21+ 5G |
|---|---|---|
| Display | 6.8-inch Dynamic AMOLED 2X, 3200×1440, 120Hz | 6.7-inch Dynamic AMOLED 2X, 2400×1080, 120Hz |
| Rear camera | 108MP wide + 12MP ultrawide + 10MP 3x tele + 10MP 10x periscope | 12MP wide + 12MP ultrawide + 64MP telephoto |
| Front camera | 40MP | 10MP |
| Battery | 5,000 mAh, 25W wired / 15W wireless | 4,800 mAh, 25W wired / 15W wireless |
| Weight | 227 g | 200 g |
| Dimensions | 165.1 × 75.6 × 8.9 mm | 161.5 × 75.6 × 7.8 mm |
| Memory | 12GB or 16GB RAM, 128/256/512GB | 8GB RAM, 128/256GB |
| SIM-free price | Not available | From £129.00 |
£1000-£1499 Phones · 33 phones
Based on calibrated CPU benchmark rankings (60%) and GFXBench GPU scores (40%). Apple chipsets included via editorial calibration since AnTuTu under-represents Apple's architecture.
Based on panel type (LTPO is the modern flagship gold standard), resolution, refresh rate, peak brightness, screen size, and HDR10+ / Dolby Vision support. Marketing peak-brightness claims are capped at 3500 nits to prevent inflation.
Based on main-sensor size (1-inch / 1/1.3" beats 1/2.0"), telephoto reach (periscope > 5x > 3x optical), image processing tier (Apple Pro, Pixel Pro, Galaxy Ultra, Honor Magic Pro, Xiaomi Ultra), pro video features (ProRes, Apple Log, Dolby Vision), camera-partnership branding (Leica, Hasselblad, Zeiss) and OIS. Older flagships are de-rated since image processing pipelines have advanced significantly each generation. Megapixel count is deliberately downweighted — it correlates poorly with real-world camera quality.
Based on selfie megapixels and max selfie-video resolution.
Based on battery capacity (mAh) adjusted for platform efficiency calibrated against NotebookCheck, Tom's Guide, GSMArena and CNET reviewer tests. Apple A-series gets +45% (iOS process freezing + LTPO 1Hz + tuned panels make iPhone Pro Max outlast many 6500+ mAh Android phones in measured tests). Top Snapdragon / Dimensity flagships get +15%, budget chipsets are penalised −15% to −25% to reflect less efficient displays and looser background limits. Charging speed is excluded — see the separate Fast charging tag for that.
165.1 x 75.6 x 8.9
227 g
Nano-SIM + eSIM
Android 11, up to 4 major upgrades
FM radio (Snapdragon model only; market/operator dependent)
Phantom Black, Phantom Silver, Phantom Titanium, Phantom Navy, Phantom Brown, Navy
108
8K@24fs, 4K@30/60fs, 1080@30/60/120/240fs, HDR10+, stereo sound rec., gyro-EIS
HDR
40 , f/2.2, 26mm (wide), 1/2.8", 0.7µm, PDAF
4320
4K@30/60fs, 1080@30fs
Dynamic AMOLED 2X, 120Hz, HDR10+, 1500 nits (peak)
6.8
1440 x 3200 pixels, 20:9 ratio (~515 ppi density)
Corning Gorilla Glass Victus
Yes, with stereo speakers
No
GSM 850 / 900 / 1800 / 1900
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71 - SM-G998U1
2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G998U1
HSPA 42.2/5.76 Mbps, LTE (7CA) Cat20 2000/200 Mbps, 5G (5+ Gbps DL)
GSM / CDMA / HSPA / EVDO / LTE / 5G
Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct
5.2, A2DP, LE
USB Type-C 3.2, OTG
Yes
GPS, GLONASS, BDS, GALILEO
5000
25W wired, PD3.0 15W wireless (Qi) 4.5W reverse wireless
Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer
