Samsung Galaxy A7 2017 vs Samsung Galaxy M21
| Type | Touch | Touch |
| Waterproofness & dust-resistance | IP68 |  |
| Dimensions | 156.80 x 77.60 x 7.90 mm | 159.00 x 75.10 x 8.90 mm |
| Weight | 186.00 g | 188.00 g |
| Display size | 5.70" | 6.40" |
| Display | Color / Super AMOLED 16M colors 1080 x 1920 px (5.70") 386 ppi | Color / Super AMOLED 16M colors 1080 x 2340 px (6.40") 403 ppi |
| Display protection | Corning Gorilla Glass Buy screen protector
 |  |
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 3G: 1380 min. (23.0 h) | 4G: 2940 min. (49.0 h) |
| Playback time (max.) | Audio: 59 h (2.5 days) Video: 20 h (0.8 days) | Audio: 131 h (5.5 days) Video: 29 h (1.2 days) |
| Internet browsing time (max.) | WiFi: 17 h (0.7 days) 3G: 13 h (0.5 days) 4G: 16 h (0.7 days) | WiFi: 22 h (0.9 days) 4G: 22 h (0.9 days) |
| Standard battery | Li-Ion 3600 mAhBuy powerbank
| Li-Ion 6000 mAhBuy powerbank
|
| Quick battery charging | Fast Charging | Fast Charging |
| Wireless battery charging | | |
| Internal memory | 32 GB | 64 GB |
| End-user memory | 23 GB | 49.5 GB |
| RAM memory | 3 GB | 4 GB |
| Memory cards |  microSD, microSDHC, microSDXC up to 256 GBBuy memory card | microSD, microSDHC, microSDXC up to 512 GBBuy memory card |
| Operating system | Android 6.0.1 Marshmallow | Android 10 |
| Interface | - | One UI |
| Processor | Samsung Exynos 7880 | Samsung Exynos 9611 |
| Processor clock | 1900 MHz | 2300 MHz |
| GPU | ARM Mali-T830 MP3 @650 MHz | ARM Mali-G72 MP3 |
| Touchscreen | | |
| SAR (10g) | 1,33 W/kg | 1,13 W/kg |
| DualSIM | | |
| SIM cards standard | SingleSIM(nanoSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | nd | dual standby |
| Hybrid DualSIM | nd | |
| Announced | 1Q 2017 | 1Q 2020 |
| Other names | SM-A720F | SM-M215F/DS; SM-M215F/DSN |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 1900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1800, 900, 850, 800 | FDD LTE: 2600, 2100, 1800, 900, 850, 800 TDD LTE: 2600, 2500, 2300 |
| Standard 5G | | |
| CDMA | | |
| Standard TD-SCDMA | 1900 2000 | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | | Standard |
| Photo matrix | 16 Mpx | 48 Mpx |
| Sensor size | | 1/2 |
| Resolution | | 8000x6000 px |
| Optical zoom | | |
| Digital zoom | | 4x |
| Field of view | | 80 ° |
| Focal length | | 26 mm |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | | 3840x2160 px |
| Video formats | H.263, H.264, MPEG4 | H.264, H.265, MPEG4 - 30 fps |
| Additional | AF, f/1.9 | AF, f/2.0 |
| Second camera | | |
| Camera type | nd | Depth of field |
| Photo matrix | nd | 5 Mpx |
| Optical zoom | nd | |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.264, H.265, MPEG4 - 30 fps |
| Additional | nd | FF, f/2.2 |
| Third camera | | |
| Camera type | nd | Wide-angle |
| Photo matrix | nd | 8 Mpx |
| Sensor size | nd | 1/4 |
| Pixel size | nd | 1,12 µm |
| Optical zoom | nd | |
| Field of view | nd | 123 ° |
| Focal length | nd | 12 mm |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.264, H.265, MPEG4 - 30 fps |
| Additional | nd | FF, f/2.2 |
CAMERAS - FRONT
| First camera | | |
| Camera type | | Portrait |
| Photo matrix | 16 Mpx | 20 Mpx |
| Optical zoom | | |
| Flash | | |
| Dual-colour LED flash | | |
| Video formats | H.263, H.264, MPEG4 | H.264, H.265, MPEG4 - 30 fps |
| Additional | FF, f/1.9 | FF, f/2.0 |
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 | 42.00 Mbit/s | 42.20 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | - | 603.00 Mbit/s |
| LTE UP | 51.00 Mbit/s | 102.00 Mbit/s |
| WIMAX+ | | |
| GPRS | class 12 | |
| EDGE | | |
| Bluetooth | v4.2 | 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 | | |
| QZSS | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | XT9 | 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 | 3GA, AAC, AMR, AWB, FLAC, IMY, M4A, MID, MIDI, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, WMA, XMF | 3GA, AAC, AAC+, AMR, AWB, FLAC, IMY, M4A, MID, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, WMA, XMF, eAAC+ |
| Polyphony | 64 voices | |
| 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 | | |