📱 Model features |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Model | Galaxy A21 (SM-A215U) | Mi Mix 2S (128GB) |
| Other model names | Galaxy A21 SM-A215U (Sprint, T-Mobile, US Cellular, Verizon) | 小米MIX 2S, Xiaomi Mix 2S (128GB + 6GB RAM), Xiaomi Polaris |
| Country or region available | 
USA | 
(Global, International) |
| Brand | Samsung | Xiaomi |
| Release date | 6/26/2020 | 4/3/2018 |
| Depth | 8.1 millimeters (0.32 inches) | 8.1 millimeters (0.32 inches) |
| Size (width x height) | 76.7 x 167.8 millimeters (3.02 x 6.61 in) | 74.9 x 150.86 millimeters (2.95 x 5.94 in) |
| Weight | 193 grams (6.76 ounces) | 189 grams (6.62 ounces) |
| Build, materials | Plastic body, glass front | Aluminum body, glass front, ceramic back |
| Protection against water and others | Not supported | Not supported |
🤖 Operating System |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| System version | Android 10 | Android 8.0 Oreo |
| Firmware update | feature not registered | Android 10 |
| User Interface | feature not registered | feature not registered |
⚙️ Processor |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Chipset | 64bit - MediaTek Helio P35 (MT6765) (12nm) | 64bit - Qualcomm Snapdragon 845 MSM8998 (10nm) |
| CPU | Octa-Core, 2 processors:
2.3GHz Quad-Core ARM Cortex-A53
1.8GHz Quad-Core ARM Cortex-A53 | Octa-Core, 2 processors:
2.8GHz Quad-Core Kryo 385 Gold
1.8GHz Quad-Core Kryo 385 Silver |
| GPU graphical controller | PowerVR GE8320 MP2 (680MHz) | Qualcomm Adreno 630 710Mhz |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| RAM memory | 3GB LPDDR3 | 6GB LPDDR4X |
| Internal storage | 32GB (20GB available)
eMMC 5.1 | 128GB (118GB available)
UFS 2.1 |
| External storage | Until 512GB microSD, microSDXC
(dedicated slot) | Not supported |
📲 Display |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Display type | TFT PLS | TFT IPS LCD |
| Screen size | 6.5" inches | 5.99" inches |
| Screen-to-body ratio | ~79.3% (screen-to-body ratio) | ~81.9% (screen-to-body ratio) |
| Display resolution | 720x1600 pixels (20:9) | 1080x2160 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 270 PPI | 403 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Not supported | Gorilla Glass 4 |
| Display features | 60Hz | feature not registered |
📶 Mobile networks |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Dual-SIM | Not supported | Dual-SIM Standby - Call active on one sim card |
| SIM card | 1 slot (Single-SIM)
nano-SIM (4FF) | 2 slots (Dual-SIM)
nano-SIM (4FF) |
| Maximum download/upload | 150/50 Mbps | 1200/100 Mbps |
| Network technology | 2G, 3G, 4G | 2G, 3G, 4G |
| Frequency, bands | Expand band detailsCollapse details |
| GSM MHz band | Quad-Band 850/900/1800/1900 | Quad-Band 850/900/1800/1900 |
| Primary 2G network | CDMA 800/1900, GSM 850/900/1800/1900 | CDMA 800/1900/2100, GSM 850/900/1800/1900 |
| Primary 3G network | CDMA2000 1xEV-DO
UMTS 850/900/1700/1900/2100 | CDMA2000 1xEV-DO
TD-SCDMA 1900/2000
M1803D5XA Global version:
UMTS 800/850/900/1700/1800/1900/2100
M1803D5XE/M1803D5XC/M1803D5XT versions:
UMTS 850/900/1700/1900/2100 |
| Primary 4G network | LTE Cat4 (1, 2, 3, 5, 7, 8, 20, 28)
TD-LTE (38, 40, 41)
VoLTE | LTE Cat18
M1803D5XA Global version:
LTE (Bands 1,2,3,4,5,7,8,12,13,17,18,19,20,25,26,27,28,29,30)
TD-LTE (Bands 34,38,39,40,41)
M1803D5XE/M1803D5XC/M1803D5XT versions:
LTE (Bands 1,2,3,4,5,7,8,12,17,20)
TD-LTE (Bands 34,38,39,40,41) |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A |
| Secondary 2G network | Not supported | GSM 850/900/1800/1900 |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | GPRS, EDGE |
📷 Camera |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Back camera (main camera) | (quad camera)
16 megapixels
8MP ultrawidef/2.21/4.0"1.12µm
2MP macrof/2.4
2MP depthf/2.4 | (dual camera)
12 megapixels
12MPf/2.41/3.4"1µmAF |
| Main camera resolution | 4608x3456 pixels | 4000x3000 pixels |
| Video recording (primary) | Full HD (1920x1080) 30 fps | 4K UHD (3840x2160) 30 fps |
| Flash | LED flash | Dual-LED flash |
| Focal aperture | f/1.8 (aperture) | f/1.8 (aperture) |
| Focal length | feature not registered | feature not registered |
| Sensor size | 1/3.06" inches | 1/2.55" inches |
| Pixel size | 1µm pixel | 1.4µm pixel |
| Autofocus | PDAF: phase detection autofocus | PDAF: phase detection autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | EIS: Digital stabilization | OIS (4-axis): Optical stabilization |
| Zoom | Only digital zoom | Digital and optical zoom |
| Face/smile detection | Face detection, Smile detection | Face detection, Smile detection |
| BSI sensor | Not supported | Not supported |
| HDR | HDR photo on both cameras | HDR photo on both cameras |
| Camera extras | feature not registered | feature not registered |
📸 Front camera |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Front camera (secondary) | 13 megapixels | 5 megapixels |
| Front camera resolution | 4128x3096 pixels | 2560x1920 pixels |
| Video recording (secondary) | Full HD (1920x1080) | Full HD (1920x1080) |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.0 (aperture) | f/2.0 (aperture) |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | 1.12µm pixel | 1.4µm pixel |
🔉 Sound and multimedia |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Loudspeaker | Supported | Supported |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | FM | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4, H.265, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263, XviD |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, OGG, eAAC+, FLAC |
🔌 Connectivity |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| USB | USB 2.0 Type-C reversible connector | USB 2.0 Type-C reversible connector |
| Audio output | 3.5mm jack | Type-C reversible connector |
| TV output | Not supported | Not supported |
| Bluetooth | 5.0 + A2DP/LE | 5.0 + A2DP/LE |
| WiFi | 802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
WiFi Direct, hotspot | 802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
WiFi Direct, hotspot |
| DLNA | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS, BeiDou |
| NFC | Not supported | Supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Sensors | Accelerometer
Ambient Light sensor
Compass
Face unlock
Fingerprint sensor (rear-mounted)
Gyroscope
Proximity sensor | Accelerometer
Ambient Light sensor
Barometer
Compass
Face unlock
Fingerprint sensor (rear-mounted)
Gyroscope
Hall effect
Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Battery type | LiPo: Li-Ion polymer (Non removable) | Li-Ion: Lithium-Ion (Non removable) |
| Battery capacity | 4000 mAh | 3400 mAh |
| Charger, watts | 15W Fast battery charging | 18W (9V/2A) Fast battery charging
Qi wireless charging |
| Talk time autonomy | feature not registered | feature not registered |
| Standby | feature not registered | feature not registered |
➕ Other features |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| Call control | Voice dialing, Voice recorder, Voice commands | Voice dialing, Voice recorder, Voice commands |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), MMS, E-mail, Push mail |
| Hands-free calling | Supported | Supported |
| Video calling | Supported | Supported |
| Ringtones | Polyphonic and customized | Polyphonic and customized |
| Web browser | HTML, XHTML, HTML5 | HTML, XHTML, HTML5 |
| Antenna | Internal antenna | Internal antenna |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | - Colors: Black
- One UI 2.0 | - Colors: Black, White
- MIUI 9.5
- HDR10 display support
- Quick Charge 3.0
- Type-C to 3.5 mm headphone jack adapter
- VoLTE |
☢️ Radiation rate |
| Samsung Galaxy A21 (SM-A215U) | Xiaomi Mi Mix 2S (128GB) |
| SAR 1.6W/kg (USA, Mexico, etc.) | 0.6W/kg (head), 1.27W/kg (body) | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |