Xiaomi Redmi 15 5G vs Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB)
Quick Comparison
Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has better RAM than Xiaomi Redmi 15 5G. In terms of display resolution, Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has better resolution of 3200 x 1440 than Xiaomi Redmi 15 5G which has resolution of 2340 x 1080. Both have the same amount of internal memory.
| Name | Xiaomi Redmi 15 5G | Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) |
| RAM | 6 GB | 12 GB |
|---|---|---|
| Display | 6.9 in | 6.8 in |
| Internal Memory | 128 GB | 128 GB |
| Battery | 7000 mAh | 5000 mAh |
| Camera | 50 MP Dual | 108 MP Quad |
| Price | Rs. 21499 | Rs. 101999 |
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Detailed Comparison
Price And Launch
The launch Date of the first phone is August 01, 2025. The cost of Xiaomi Redmi 15 5G is Rs. 21499. The launch Date of the second phone is January 14, 2021. The Expected cost of Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) is Rs. 101999.
Display comparison
Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has screen size of 6.8 inches which falls short to Xiaomi Redmi 15 5G's 6.9 inch screen. Xiaomi Redmi 15 5G has IPS Screen type where as Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has Screen type. Samsung's phone has display density of 515 PPI & Xiaomi's phone has only 374 PPI display density. In terms of screen to body ratio, Samsung's phone has better screen to body ratio of ~ 89.8% than Xiaomi's phone ~ 83.2%. Xiaomi Redmi 15 5G has 20.6:9 aspect ratio where as Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has 20:9 aspect ratio.
Memory comparison
Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB)'s larger 12 GB RAM is better for playing games and all with respect to Xiaomi Redmi 15 5G's lower 6 GB RAM. and both have same Internal Memory of 128 GB.
Camera comparison
Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB)'s 108 MP Quad Rear Camera outshines Xiaomi Redmi 15 5G's 50 MP Dual Rear Camera in terms of resolution. Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) will be better choice if you're looking to click lot of selfies as it has better 40 MP Front Camera in comparison to Xiaomi Redmi 15 5G's 8 MP Front Camera.
Technical comparison
Both the phones has Android Operating System but the first one runs on version 15 and the second one on 10 version.
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Full Comparison
| Name | Xiaomi Redmi 15 5G | Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) |
| General | ||
| Country of Origin | India | |
| Model | 15 5G | Galaxy S21 Ultra 5G |
| Sim Type | Dual Sim, GSM+GSM (Hybrid Slot) | Dual Sim, GSM+GSM |
| 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 | August 01, 2025 | January 14, 2021 |
| 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 | 80.45 x 168.48 x 8.4 mm | 75.6 x 165.1 x 8.9 mm |
| Weight | 217 g | 227 g |
| Colors | Sandy Purple, Frosted White, Midnight Black | |
| Display | ||
| Type | Color IPS Screen (16M Colors) | Color Dynamic AMOLED 2X (16M Colors) |
| Touch | Yes, 288 Hz Touch Sampling Rate | Yes |
| Size | 6.9 inches, 1080 x 2340 pixels, 144 Hz | 6.8 inches, 1440 x 3200 pixels, 120 Hz |
| Aspect Ratio | 20.6:9 | 20:9 |
| PPI | ~ 374 PPI | ~ 515 PPI |
| Screen to Body Ratio | ~ 83.2% | ~ 89.8% |
| Glass Type | Corning Gorilla Glass Victus | |
| Brightness | 850nits Peak Brightness | |
| HDR Support | Yes, HDR10+ | |
| Features | TÜV Rheinland Circadian Friendly, TÜV Rheinland flicker free, TÜV Rheinland Low Blue light | Always-on Display, HDR10+ |
| Notch | Yes, Punch Hole | Yes, Punch Hole |
| Memory | ||
| RAM | 6 GB | 12 GB |
| RAM Type | LPDDR4X | |
| Storage | 128 GB | 128 GB |
| Storage Type | UFS 2.2 | UFS 3.1 |
| 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 | Yes, Dual Stand-By |
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot |
| Bluetooth | Yes, v5.1, A2DP, LE | Yes, v5.2, A2DP, LE |
| USB | Yes, USB-C | Yes, USB-C v3.2 |
| USB Features | USB on-the-go, USB Charging | USB on-the-go, USB Charging |
| IR Blaster | Yes | |
| Extra | ||
| GPS | Yes, with A-GPS, Glonass, Beidou | Yes, with A-GPS, GLONASS, BDS, GALILEO |
| Fingerprint Sensor | Yes, Side | Yes, In Display |
| Face Unlock | Yes | Yes |
| Sensors | Ambient Light Sensor, Proximity Sensor (Virtual), E Compass, Accelerometer | Accelerometer, Gyro, Proximity, Compass, Barometer |
| 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 | IP64 | IP68 |
| Dust Resistant | Yes | Yes |
| Extra Features | Hydro Touch | |
| Camera | ||
| Rear Camera | 50 MP ƒ/1.75 (Wide Angle) | 108 MP ƒ/1.8 10 MP ƒ/4.9 (Telephoto) 10 MP ƒ/2.4 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) |
| OIS | Yes | |
| Auto Focus | Yes | Yes |
| Features | AI Sky, AI Erase, Classic Film Filters | Auto-HDR, Panorama |
| Video Recording | 1080p @ 30 fps FHD | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 240/30/60 fps FHD, 720p @ 960 fps HD |
| Flash | Yes, LED | Yes, LED |
| Front Camera | 8 MP ƒ/2.2 (Wide Angle) Punch Hole, Screen Flash | 40 MP ƒ/2.2 (Wide Angle) Punch Hole, Autofocus |
| Front Video Recording | 1080p @ 30 fps FHD | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD |
| Front Camera Features | HDR | Dual video call, Auto-HDR |
| Technical | ||
| OS | Android v15 | Android v10 |
| Custom UI | HyperOS 2 | |
| Chipset | Qualcomm Snapdragon 6s Gen3 | Samsung Exynos 2100 |
| CPU | 2.3 GHz, Octa Core Processor | 2.9 GHz, Octa Core Processor |
| Core Details | 2x2.3 GHz Cortex-A78 & 6x2.0 GHz Cortex-A55 | 1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55 |
| GPU | Adreno 619 | Mali-G78 MP14 |
| Java | No | No |
| Browser | Yes, supports HTML5 | Yes |
| Multimedia | ||
| Yes | Yes | |
| Music | Yes | Yes |
| Video | Yes | Yes |
| FM Radio | Yes | No |
| 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 | 7000 mAh, Si-C EV-Grade Technology | 5000 mAh, Li-Po Battery |
| Fast Charging | Yes, 33W | Yes, 25W Fast Charging |
| Wireless Charging | Yes, 15W | |
| Reverse Charging | Yes, 18W | Yes, 4.5W |