Redmi Note 9 vs Samsung Galaxy A21s Dual SIM
| Type | Touch | Touch |
| Dimensions | 162.30 x 77.20 x 8.90 mm | 163.70 x 75.30 x 8.90 mm |
| Weight | 199.00 g | 192.00 g |
| Display size | 6.53" | 6.50" |
| Display | Color / IPS TFT 16M colors 1080 x 2340 px (6.53") 395 ppi | Color / IPS TFT 16M colors 60 Hz 720 x 1600 px (6.50") 270 ppi |
| Display protection | Corning Gorilla Glass Buy screen protector
 |  |
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 3G: 1980 min. (33.0 h) |  |
| Playback time (max.) | Audio: 147 h (6.1 days) | nd |
| Standard battery | Li-Ion 5020 mAhBuy powerbank
| Li-Ion 5000 mAhBuy powerbank
|
| Quick battery charging |  | Fast Charging |
| Wireless battery charging | | |
| Internal memory | 64 GB, 128 GB | 32 GB, 64 GB |
| RAM memory | 3 GB, 4 GB, 6 GB | 3 GB, 4 GB, 6 GB |
| Memory cards | microSD, microSDHC, microSDXC | microSD, microSDHC, microSDXC up to 512 GBBuy memory card |
| Operating system | Android 10 | Android 10 |
| Interface | MIUI 11 | One UI 2.0 |
| Processor | MediaTek Helio G85 MT6769V | Samsung Exynos 850 |
| Processor clock | 2000 MHz | 2000 MHz |
| GPU | ARM Mali-G52 MC2 @1 GHz | - |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | dual standby | dual standby |
| Hybrid DualSIM | | |
| Announced | 2Q 2020 | 2Q 2020 |
| Other names | Xiaomi Redmi Note 9 | SM-A217F/DS; SM-A217F/DSN; SM-A217M/DS |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1700 1900 2100 | 850 900 1700 1900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1900, 1800, 1700, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300 | FDD LTE: 2600, 2300, 1900, 1800, 1700, 850, 800, 700 |
| Standard 5G | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | Standard | Standard |
| Photo matrix | 48 Mpx | 48 Mpx |
| Sensor size | 1/2 | |
| Pixel size | 0,8 µm | 0,8 µm |
| Optical zoom | | |
| Number of lenses | 6 | |
| Field of view | 79 ° | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | | 1920x1080 px |
| Video formats | H.263, H.264, MPEG4 - 30 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | AF, f/1.79 | AF, f/2.0 |
| Second camera | | |
| Camera type | Wide-angle | Wide-angle |
| Photo matrix | 8 Mpx | 8 Mpx |
| Sensor size | 1/4 | |
| Pixel size | 1,2 µm | 1,12 µm |
| Optical zoom | | |
| Number of lenses | 5 | |
| Field of view | 118 ° | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | H.263, H.264, MPEG4 - 30 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | FF, f/2.2 | FF, f/2.2 |
| Third camera | | |
| Camera type | Macro | Macro |
| Photo matrix | 2 Mpx | 2 Mpx |
| Pixel size | 1,75 µm | |
| Optical zoom | | |
| Focal length | 20 mm | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | H.263, H.264, MPEG4 - 30 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | FF, f/2.4 | FF, f/2.4 |
| Fourth camera | | |
| Camera type | Depth of field | Depth of field |
| Photo matrix | 2 Mpx | 2 Mpx |
| Sensor size | 1/5 | |
| Pixel size | 1,7 µm | |
| Optical zoom | | |
| Number of lenses | 3 | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | H.263, H.264, MPEG4 - 30 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | FF, f/2.4 | FF, f/2.4 |
CAMERAS - FRONT
| First camera | | |
| Camera type | Portrait | Portrait |
| Photo matrix | 13 Mpx | 13 Mpx |
| Sensor size | 1/3,06 | 1920x1080 |
| Pixel size | 1,12 µm | |
| Optical zoom | | |
| Number of lenses | 5 | |
| Field of view | 74 ° | |
| Flash | | |
| Dual-colour LED flash | | |
| Video formats | H.263, H.264, MPEG4 - 30 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | FF, f/2.25 | FF, f/2.2 |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | 42.20 Mbit/s | 42.20 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | 301.50 Mbit/s | - |
| LTE UP | 150.80 Mbit/s | - |
| WIMAX+ | | |
| GPRS | | class 33 |
| EDGE | | class 33 |
| Bluetooth | v5.0 | v5.0 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n/ac | v802.11 a/b/g/n/ac |
| WiFi frequencies | 2,4 GHz; 5 GHz | 2,4 GHz; 5 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 Type-C | v2.0 Type-C |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| Galileo | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | T9 | T9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC, AAC+, AMR, FLAC, MKA, WAV, eAAC+ | 3GA, AAC, AMR, AWB, FLAC, IMY, M4A, MID, MIDI, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, WMA, XMF |
| Polyphony | | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | ART | ART |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |