Asus Zenfone 3 Ultra (ZU680KL 128GB) vs Samsung Galaxy A21s (SM-A217F/DSN 64GB/6GB)
Side by side comparison between Asus Zenfone 3 Ultra vs Samsung Galaxy A21s phones, differences, pros, cons and full specifications. What's the better?
,
6.8"
IPS+
IPS+
1080x1920
23
MP
MP
8mp
4GB
RAM
RAM
Octa-core
4600
mAh
mAh
(Non removable)
vs
6.5"
PLS
PLS
720x1600
48
MP
MP
13mp
6GB
RAM
RAM
Octa-core
5000
mAh
mAh
(Non removable)
What's the better phone? Samsung Galaxy A21s (SM-A217F/DSN 64GB/6GB)
The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!
12 Advantages 
13 Advantages | 22 Common items in both devices |
| 16 million |
| Only digital zoom |
| LDAF/PDAF: laser/phase detection autofocus / PDAF: phase detection autofocus |
| HDR photo on both cameras |
| f/2.0 (aperture) |
| (front) Full HD (1920x1080) |
| 4G LTE-A |
| +15 specs and more in the table below |
Check the comparison table below for more items that are not evaluated in comparison score above.
Highlight differences Clear highlight📱 Model features | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Model | Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) |
| Other model names | Asus Zenfone 3 Ultra 4GB/128GB ZU680KL DualSim, Asus Mercury | Galaxy A21s SM-A217F/Dual-Sim NFC (64GB + 6GB RAM) |
| Country or region available |  (Global, International) |  Hong Kong |
| Brand | Asus | Samsung |
| Release date | 8/1/2016 | 6/2/2020, Announced: 5/15/2020 |
| Depth | 6.8 millimeters (0.27 inches) | 8.9 millimeters (0.35 inches) |
| Size (width x height) | 93.9 x 186.4 millimeters (3.7 x 7.34 in) | 75.3 x 163.7 millimeters (2.96 x 6.44 in) |
| Weight | 233 grams (8.16 ounces) | 192 grams (6.72 ounces) |
| Build, materials | feature not registered | Plastic body, glass front |
| Protection against water and others | Not supported | Not supported |
📲 Display | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Display type | TFT Super IPS+ | TFT PLS |
| Screen size | 6.8" inches | 6.5" inches |
| Screen-to-body ratio | ~72.8% (screen-to-body ratio) | ~82.8% (screen-to-body ratio) |
| Display resolution | 1080x1920 pixels | 720x1600 pixels (20:9) |
| Touchscreen | Capacitive Multitouch 10-points | Capacitive Multitouch |
| Pixel density (dot pitch) | 324 PPI | 270 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass 4 | Not supported |
| Refresh rate | feature not registered | 60Hz |
| Display features | feature not registered | Not supported |
🤖 Operating System | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| System version | Android 6.0.1 Marshmallow | Android 10 |
| Firmware update | Android 8.0 Oreo | Android 12 |
| User Interface | feature not registered | One UI 2.0 / 3.1 / 4.1 |
⚙️ Processor | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Chipset | 64bit: Qualcomm Snapdragon 652 MSM8976 (28nm) | 64bit: Samsung Exynos 850 (8nm) |
| CPU | Octa-core, 2 processors: 4x 1.8GHz ARM Cortex-A72 (Quad-core) 4x 1.4GHz ARM Cortex-A53 (Quad-core) | Octa-core, 1 processor: 8x 2GHz ARM Cortex-A55 (Octa-core) |
| GPU graphical controller | Qualcomm Adreno 510 600Mhz | ARM Mali-G52 MP1 |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| RAM memory | 4GB LPDDR4 | 6GB LPDDR4X |
| Internal storage | 128GB (118GB available) | 64GB (48GB available) eMMC 5.1 |
| External storage | Until 256GB microSD, microSDXC (hybrid slot/shares the same SIM-2 slot) | Until 512GB microSD, microSDXC (dedicated slot) |
📶 Mobile networks | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card (hybrid slot/shares the same microSD slot) | Dual-SIM Standby - Call active on one sim card (dedicated slot) |
| SIM card | 2 slots (Dual-SIM) micro-SIM (3FF) and nano-SIM (4FF) | 2 slots (Dual-SIM) nano-SIM (4FF) |
| Maximum Download / Upload | 300/50 Mbps | 300/150 Mbps |
| Network technology | 2G, 3G, 4G | 2G, 3G, 4G |
| Frequency, bands | Expand band details Collapse 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 | Global version: UMTS 800/850/900/1900/2100 China version: CDMA2000, TD-SCDMA 1900/2000 UMTS 800/850/900/1900/2100 | UMTS 850/900/1900/2100 |
| Primary 4G network | LTE Cat6 Global version: LTE (Bands 1,3,5,7,8,18,19,20,26,28) TD-LTE (Bands 38,40,41) China version: LTE (Bands 1,3,5,7,8,18,19,20,26,28) TD-LTE (Bands 38,39,40,41) | LTE Cat7/13 (1, 2, 3, 5, 7, 8, 20, 28) TD-LTE (38, 40, 41) |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A |
| Secondary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Secondary 3G network | Not supported | UMTS 850/900/1900/2100 |
| Secondary 4G network | Not supported | LTE Cat7/13 (1, 2, 3, 5, 7, 8, 20, 28) TD-LTE (38, 40, 41) |
| Secondary data network | GPRS, EDGE | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A |
📷 Camera | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Back camera (main camera) | 23 megapixels | (quad camera) 48 megapixels 8MP ultrawide f/2.21/4"1.12µm123° 2MP macro f/2.4 2MP depth f/2.4 |
| Main camera resolution | 5520x4140 pixels | 8000x6000 pixels |
| Video recording (primary) | 4K UHD (3840x2160) 24 fps | Full HD (1920x1080) 30 fps |
| Flash | Dual-LED flash | LED flash |
| Focal aperture | f/2.0 (aperture) | f/2.0 (aperture) |
| Focal length | feature not registered | 26mm lens |
| Sensor size | 1/2.6" inches | 1/2" inches |
| Pixel size | 1.12µm pixel | 0.8µm pixel |
| Autofocus | LDAF/PDAF: laser/phase detection autofocus | PDAF: phase detection autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | OIS (4-axis): Optical stabilization | EIS: Digital 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 |
| Camera extras | feature not registered | feature not registered |
📸 Front camera | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Front camera (secondary) | 8 megapixels | 13 megapixels |
| Front camera resolution | 3264x2448 pixels | 4128x3096 pixels |
| Video recording (secondary) | Full HD (1920x1080) | Full HD (1920x1080) |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.0 (aperture) | f/2.2 (aperture) |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | 1/3.1" inches |
| Pixel size | feature not registered | 1.12µm pixel |
🔉 Sound and multimedia | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Loudspeaker | Supported | Mono sound (not stereo) |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | FM (RDS) | FM |
| TV | Not supported | Not supported |
| Video formats | MP4, H.264, H.263 | MP4, H.265, H.264, H.263, XviD, MKV |
| Audio formats | MP3, WAV, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| USB | USB 2.0 Type-C reversible connector | USB 2.0 Type-C reversible connector |
| Audio output | 3.5mm jack | 3.5mm jack |
| TV output | USB Type-C SlimPort® | Not supported |
| Bluetooth | 4.2 + A2DP | 5.0 + A2DP/LE |
| WiFi | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) WiFi Direct, hotspot | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot |
| DLNA | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS, BeiDou | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
| NFC | Not supported | Supported |
| Infrared port | Supported | Not supported |
🧭 Sensors | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Sensors | Accelerometer Ambient light sensor Compass Fingerprint sensor Gyroscope Hall effect Proximity sensor | Accelerometer Compass Face unlock Fingerprint sensor (rear-mounted) Gyroscope Proximity sensor Virtual ambient light sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Battery type | Li-Ion: lithium-ion (Non removable) | LiPo: li-ion polymer (Non removable) |
| Battery capacity | 4600 mAh | 5000 mAh |
| Charger, watts | 18W (9V/2A) Wired fast charging | 15W (9V/1.67A) Wired fast charging |
| Inductive / wireless charging | feature not registered | Not supported |
| Talk time autonomy | 34 hours (1.4 days) | feature not registered |
| Standby | feature not registered | feature not registered |
➕ Other features | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| Call control | Voice dialing, Voice recorder | 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: Titanium Gray, Glacier Silver, Rose Gold • USB OTG On-The-Go • Asus ZenUI 3.0 • Sony IMX318 sensor camera • DTS headphone • Hi-Res audio 192kHz/24bit • Quick Charge 3.0 • Fast charging battery: 60% in 45min • Miracast | • Colors: Black, White, Blue, Red |
☢️ Radiation rate | ||
| Asus Zenfone 3 Ultra (ZU680KL 128GB) | Galaxy A21s (SM-A217F/DSN 64GB/6GB) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | 0.422W/kg (head), 1.544W/kg (body) |