Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) vs Xiaomi Redmi 15 5G
Here you can compare Samsung Galaxy S21 Ultra 5G (12GB RAM … and Xiaomi Redmi 15 5G. Comparing Samsung Galaxy S21 Ultra 5G (12GB RAM … vs Xiaomi Redmi 15 5G on Smartprix enables you to check their respective specs scores and unique features. It would potentially help you understand how Samsung Galaxy S21 Ultra 5G (12GB RAM … stands against Xiaomi Redmi 15 5G and which one should you buy The current lowest price found for Samsung Galaxy S21 Ultra 5G (12GB RAM … is ₹1,01,999 and for Xiaomi Redmi 15 5G is ₹21,499. The details of both of these products were last updated on Oct 04, 2026.
| Specification | Samsung Galaxy S21 Ultra 5G (12GB RAM … | Xiaomi Redmi 15 5G |
|---|---|---|
| Rear Camera | 108 MP ƒ/1.8 10 MP ƒ/4.9 (Telephoto) 10 MP ƒ/2.4 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) | 50 MP ƒ/1.75 (Wide Angle) |
| CPU | 2.9 GHz, Octa Core Processor | 2.3 GHz, Octa Core Processor |
| RAM | 12 GB | 6 GB |
| Display | 6.8 inches, 1440 x 3200 pixels, 120 Hz | 6.9 inches, 1080 x 2340 pixels, 144 Hz |
| Internal Memory | 128 GB | 128 GB |
| Price | ₹1,01,999 | ₹21,499 |
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Overview
| Specs Score | 80 / 100 Better Specs | 61 / 100 |
| Display Resolution | 1440 x 3200 pixels Better Resolution | 1080 x 2340 pixels |
| Screen To Body Ratio | ~ 89.8% Less Bezels | ~ 83.2% |
| RAM | 12 GB More RAM | 6 GB |
| CPU Clock Speed | 2.9 GHz Faster Clock Speed | 2.3 GHz |
| Rear Camera | 108 MP Quad Better Camera Resolution | 50 MP Dual |
| Front Camera | 40 MP Better Front Camera Resolution | 8 MP |
| Thickness | 8.9 mm | 8.4 mm Slimmer |
| Battery | 5000 mAh | 7000 mAh Bigger Battery |
| Unique Features | No Water Resistant NFC No Wireless Charging No | FM Radio No No Memory Card Support No IR Blaster |
General
| Country of Origin | India | |
| Model | Galaxy S21 Ultra 5G | 15 5G |
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM (Hybrid Slot) |
| Dual Sim | Yes | Yes |
| Sim Size | Nano+Nano SIM | Nano+Nano SIM |
| Device Type | Smartphone | Smartphone |
| OS Updates | 2 years | |
| Security Updates | 4 years | |
| Release Date | January 14, 2021 | August 01, 2025 |
| In The Box | Mobile Phone * 1, Adapter * 1, USB Type-C cable * 1, SIM Eject Tool * 1, Quick Start Guide, & Warranty Card * 1, Safety Information * 1 |
Design
| Dimensions | 75.6 x 165.1 x 8.9 mm | 80.45 x 168.48 x 8.4 mm |
| Weight | 227 g | 217 g |
| Colors | Sandy Purple, Frosted White, Midnight Black |
Display
| Type | Color Dynamic AMOLED 2X (16M Colors) | Color IPS Screen (16M Colors) |
| Touch | Yes | Yes, 288 Hz Touch Sampling Rate |
| Size | 6.8 inches, 1440 x 3200 pixels, 120 Hz | 6.9 inches, 1080 x 2340 pixels, 144 Hz |
| Aspect Ratio | 20:9 | 20.6:9 |
| PPI | ~ 515 PPI | ~ 374 PPI |
| Screen to Body Ratio | ~ 89.8% | ~ 83.2% |
| Glass Type | Corning Gorilla Glass Victus | |
| Brightness | 850nits Peak Brightness | |
| HDR Support | Yes, HDR10+ | |
| Features | Always-on Display, HDR10+ | TÜV Rheinland Circadian Friendly, TÜV Rheinland flicker free, TÜV Rheinland Low Blue light |
| Notch | Yes, Punch Hole | Yes, Punch Hole |
Memory
| RAM | 12 GB | 6 GB |
| RAM Type | LPDDR4X | |
| Storage | 128 GB | 128 GB |
| Storage Type | UFS 3.1 | UFS 2.2 |
| Card Slot | Yes, (Hybrid Slot), upto 1 TB |
Connectivity
| GPRS | Yes | Yes |
| EDGE | Yes | Yes |
| 3G | Yes | Yes |
| 4G | Yes | Yes |
| 5G | Yes | Yes |
| 5G Bands | SA: n1/n3/n5/n8/n28/n40/n78, NSA: n1/n3/n40/n78/n8 | |
| VoLTE | Yes, Dual Stand-By | Yes |
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot |
| Bluetooth | Yes, v5.2, A2DP, LE | Yes, v5.1, A2DP, LE |
| USB | Yes, USB-C v3.2 | Yes, USB-C |
| USB Features | USB on-the-go, USB Charging | USB on-the-go, USB Charging |
| IR Blaster | Yes |
Extra
| GPS | Yes, with A-GPS, GLONASS, BDS, GALILEO | Yes, with A-GPS, Glonass, Beidou |
| Fingerprint Sensor | Yes, In Display | Yes, Side |
| Face Unlock | Yes | Yes |
| Sensors | Accelerometer, Gyro, Proximity, Compass, Barometer | Ambient Light Sensor, Proximity Sensor (Virtual), E Compass, Accelerometer |
| 3.5mm Headphone Jack | No | |
| NFC | Yes | |
| AI Features | Circle to Search, Gemini AI, AI Erase | |
| Water Resistance | Yes, 1.5 m upto 30 min | |
| Splash Resistant | Yes | |
| IP Rating | IP68 | IP64 |
| Dust Resistant | Yes | Yes |
| Extra Features | Hydro Touch |
Camera
| Rear Camera | 108 MP ƒ/1.8 10 MP ƒ/4.9 (Telephoto) 10 MP ƒ/2.4 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) | 50 MP ƒ/1.75 (Wide Angle) |
| OIS | Yes | |
| Auto Focus | Yes | Yes |
| Features | Auto-HDR, Panorama | AI Sky, AI Erase, Classic Film Filters |
| Video Recording | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 240/30/60 fps FHD, 720p @ 960 fps HD | 1080p @ 30 fps FHD |
| Flash | Yes, LED | Yes, LED |
| Front Camera | 40 MP ƒ/2.2 (Wide Angle) Punch Hole, Autofocus | 8 MP ƒ/2.2 (Wide Angle) Punch Hole, Screen Flash |
| Front Video Recording | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD | 1080p @ 30 fps FHD |
| Front Camera Features | Dual video call, Auto-HDR | HDR |
Technical
| OS | Android v10 | Android v15 |
| Custom UI | HyperOS 2 | |
| Chipset | Samsung Exynos 2100 | Qualcomm Snapdragon 6s Gen3 |
| CPU | 2.9 GHz, Octa Core Processor | 2.3 GHz, Octa Core Processor |
| Core Details | 1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55 | 2x2.3 GHz Cortex-A78 & 6x2.0 GHz Cortex-A55 |
| GPU | Mali-G78 MP14 | Adreno 619 |
| Java | No | No |
| Browser | Yes | Yes, supports HTML5 |
Multimedia
| Yes | Yes | |
| Music | Yes | Yes |
| Video | Yes | Yes |
| FM Radio | No | Yes |
| Speaker Type | Bottom Firing Loud Speaker | |
| Audio Features | Dolby Certified, 200% Super Volume | |
| Document Reader | Yes | Yes |
Battery
| Type | Non-Removable Battery | Non-Removable Battery |
| Size | 5000 mAh, Li-Po Battery | 7000 mAh, Si-C EV-Grade Technology |
| Fast Charging | Yes, 25W Fast Charging | Yes, 33W |
| Wireless Charging | Yes, 15W | |
| Reverse Charging | Yes, 4.5W | Yes, 18W |
Discuss
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