Physical features | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Model | Galaxy A21s (SM-A217F) | Zenfone 5Z (ZS621KL 64GB) |
Other model names | Galaxy A21s SM-A217F Single-Sim (32GB + 3GB RAM) | Asus Zenfone 5z 6GB RAM (ZS621KL), ASUS_Z01RD |
Country or region available |    South Africa, Australia, New Zealand |  India |
Brand | Samsung | Asus |
Release date | June, 2020 | June, 2018 |
Depth | 8.9 millimeters (0.35 inches) | 7.9 millimeters (0.31 inches) |
Size (width x height) | 75.3 x 163.7 millimeters (2.96 x 6.44 in) | 75.65 x 153 millimeters (2.98 x 6.02 in) |
Weight | 192 grams (6.72 ounces) | 165 grams (5.78 ounces) |
Qwerty physical keyboard | Not supported | Not supported |
Antenna | Internal antenna | Internal antenna |
Build, materials | Plastic body, glass front | Aluminum frame, glass front/back |
Protection against water and others | Not supported | Not supported |
System (OS) | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Operating system | Android 10 | Android 8.0 Oreo |
Firmware update | feature not registered | Android 10 |
Hardware | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Chipset | 64bit - Samsung Exynos 850 Octa (8nm) | 64bit - Qualcomm Snapdragon 845 MSM8998 (10nm) |
CPU processor | Octa-Core, 2 processors: 2Ghz Quad-Core ARM Cortex-A55 2Ghz Quad-Core ARM Cortex-A55 | Octa-Core, 2 processors: 2.7Ghz Quad-Core Kryo 385 Gold 1.7Ghz Quad-Core Kryo 385 Silver |
GPU graphical controller | ARM Mali-G52 MP1 | Qualcomm Adreno 630 710Mhz |
RAM memory | 3GB LPDDR4X | 6GB LPDDR4X |
Internal storage | 32GB (19GB available) eMMC 5.1 | 64GB (51GB available) UFS 2.1 |
External storage | Until 512GB microSD, microSDXC (dedicated slot) | Until 1TB microSD, microSDXC (hybrid slot/shares the same SIM-2 slot) |
Display | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Display type | TFT PLS | TFT IPS LCD |
Screen size | 6.5" inches | 6.2" inches |
Screen-to-body ratio | ~82.8% (screen-to-body ratio) | ~83.7% (screen-to-body ratio) |
Display resolution | 720x1600 pixels (20:9) | 1080x2246 pixels (18.7:9) |
Touchscreen | Capacitive Multitouch | Capacitive Multitouch 10-points |
Pixel density (dot pitch) | 270 PPI | 402 PPI |
Colors | 16 million | 16 million |
Scratch-resistant glass | Not supported | Gorilla Glass |
Display features | 60Hz | 60Hz, 550 nits |
Mobile networks | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Dual-SIM | Not supported | Dual-SIM Standby - Call active on one sim card (hybrid slot/shares the same microSD slot) |
SIM card | 1 slot (Single-SIM) nano-SIM (4FF) | 2 slots (Dual-SIM) nano-SIM (4FF) |
Maximum download/upload | 300/150 Mbps | 800/100 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 | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
Primary 3G network | UMTS 850/900/1900/2100 | UMTS 800/850/900 |
Primary 4G network | LTE Cat7/13 (1, 2, 3, 5, 7, 8, 20, 28) TD-LTE (38, 40, 41) | LTE Cat15 (Bands 1,2,3,5,7,8,18,19,20,26,28) TD-LTE (Bands 38,39,40,41) |
Primary 5G network | Not supported | Not supported |
Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A | GPRS, EDGE, UMTS, 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 |
Calling | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), MMS, E-mail, Push mail |
Speakerphone | Supported | Supported |
Video calling | Supported | Supported |
Call control | Voice dialing, Voice recorder, Voice commands | Voice dialing, Voice recorder |
Camera | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Back camera (main camera) | (quad camera) 48 megapixels 8MP ultrawidef/2.21/4"1.12µm123º 2MP macrof/2.4 2MP depthf/2.4 | (dual camera) 12 megapixels 8MP ultrawidef/2.012mm1/4"1.12µmFF |
Main camera resolution | 8000x6000 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/2.0 (aperture) | f/1.8 (aperture) |
Focal length | 26mm lens | 24mm lens |
Sensor size | 1/2" inches | 1/2.55" inches |
Pixel size | 0.8µm 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 | Only digital 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 |
2ª camera | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Front camera (secondary) | 13 megapixels | 8 megapixels |
Front camera resolution | 4128x3096 pixels | 3264x2448 pixels |
Video recording (secondary) | Full HD (1920x1080) | Full HD (1920x1080) |
Front flash | Not supported | Not supported |
Focal aperture | f/2.2 (aperture) | f/2.0 (aperture) |
Focal length | feature not registered | 24mm lens |
Sensor size | 1/3.1" inches | 1/4" inches |
Pixel size | 1.12µm pixel | 1.12µm pixel |
Multimedia | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Radio | FM | FM |
TV | Not supported | Not supported |
Video formats | MP4, H.265, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263 |
Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, OGG, eAAC+, FLAC |
Connectivity | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
USB | USB 2.0 Type-C reversible connector | USB 2.0 Type-C, USB OTG On-The-Go |
TV output | Not supported | Not supported |
Audio output | 3.5mm jack | 3.5mm jack |
Bluetooth | 5.0 + A2DP/LE | 5.0 + A2DP/LE |
WiFi | 802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO | 802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) |
DLNA | Not supported | Not supported |
NFC | Not supported | Supported |
GPS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou | A-GPS, GeoTagging, GLONASS, BeiDou |
Infrared port | Not supported | Not supported |
Other functions | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Active noise cancellation | Supported | Supported |
Vibrating alert | Supported | Supported |
Ringtones | Polyphonic and customized | Polyphonic and customized |
Web browser | HTML, XHTML, HTML5 | HTML, XHTML, HTML5 |
Sensors | Accelerometer Proximity sensor Compass Gyroscope Face unlock Fingerprint sensor (rear-mounted)
| Accelerometer Proximity sensor Compass Ambient Light sensor Gyroscope Face unlock Fingerprint sensor (rear-mounted)
|
Other features | - Colors: Black, White, Blue, Red - One UI 2.0 - WiFi direct, hotspot | - Colors: Midnight Blue, Meteor Silver - 2.5D curved glass screen - 95% DCI-P3 coverage - Supports glove touch - ASUS ZenUI 5.0 - 24-bit/192kHz audio - DTS sound (only headphones) - WiFi direct, hotspot |
Power supply | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
Battery | LiPo: Li-Ion polymer (Non removable) | Li-Ion: Lithium-Ion (Non removable) |
Battery capacity | 5000 mAh | 3300 mAh |
Charger, watts | 15W (9V/1.67A) Fast battery charging | 18W (9V/2A) Fast battery charging |
Talk time autonomy | feature not registered | 1500 minutes | 25 hours | 1 days |
Standby | feature not registered | feature not registered |
Radiation rate | Samsung Galaxy A21s (SM-A217F) | Asus Zenfone 5Z (ZS621KL 64GB) |
SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | 1.04W/kg (head) | 0.37W/kg (body) |
SAR 2W/kg (Europe, UK, etc.) | 0.422W/kg (head) | 1.544W/kg (body) | 1.2W/kg (head) | 1.477W/kg (body) |