📱 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 |