| Physical features | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Model | Galaxy J3 2018 (SM-J337U) | Galaxy M21s (SM-F415F/DS) |
| Other model names | Galaxy J3 (2018) Unlocked SM-J337UZKAXAA | Galaxy M21s SM-F415F/Dual-Sim (4GB RAM) |
| Country or region available | 
USA |  
(Latin America), Brazil |
| Brand | Samsung | Samsung |
| Release date | May, 2018 | November, 2020 |
| Depth | 9 millimeters (0.35 inches) | 8.9 millimeters (0.35 inches) |
| Size (width x height) | 70.2 x 142.8 millimeters (2.76 x 5.62 in) | 75.1 x 159.2 millimeters (2.96 x 6.27 in) |
| Weight | 152 grams (5.32 ounces) | 191 grams (6.69 ounces) |
| Qwerty physical keyboard | Not supported | Not supported |
| Antenna | Internal antenna | Internal antenna |
| Build, materials | Plastic body, glass front | Plastic body, glass front |
| Protection against water and others | Not supported | Not supported |
| System (OS) | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Operating system | Android 8.0 Oreo | Android 10 |
| Firmware update | feature not registered | feature not registered |
| Hardware | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Chipset | 64bit - Samsung Exynos 7 Quad 7570 (14nm) | 64bit - Samsung Exynos 9 Octa 9611 (10nm) |
| CPU processor | 1.4Ghz Quad-Core ARM Cortex-A53 | Octa-Core, 2 processors:
2.3Ghz Quad-Core ARM Cortex-A73
1.7Ghz Quad-Core ARM Cortex-A53 |
| GPU graphical controller | ARM Mali-T720 MP2 | ARM Mali-G72 MP3 |
| RAM memory | 2GB LPDDR3 | 4GB LPDDR4X |
| Internal storage | 16GB (9GB available)
eMMC 5.0 | 64GB (49GB available)
eMMC 5.1 |
| External storage | Until 512GB microSD, microSDXC
(dedicated slot) | Until 512GB microSD, microSDXC
(dedicated slot) |
| Display | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Display type | TFT IPS LCD | Super AMOLED |
| Screen size | 5" inches | 6.4" inches |
| Screen-to-body ratio | ~68.8% (screen-to-body ratio) | ~84.1% (screen-to-body ratio) |
| Display resolution | 720x1280 pixels | 1080x2340 pixels (19.5:9) |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 294 PPI | 403 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Not supported | Not supported |
| Display features | feature not registered | 60Hz, 420 nits |
| Mobile networks | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Dual-SIM | Not supported | Dual-SIM Standby - Call active on one sim card
(dedicated slot) |
| SIM card | 1 slot (Single-SIM)
nano-SIM (4FF) | 2 slots (Dual-SIM)
nano-SIM (4FF) |
| Maximum download/upload | 150/50 Mbps | 300/50 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 850/900/1700/1900/2100 | UMTS 850/900/1700/1900/2100 |
| Primary 4G network | LTE Cat4 (Bands 2, 3, 4, 5, 7, 12, 14) | LTE Cat6 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 26, 28, 66)
TD-LTE (38, 40, 41)
VoLTE |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE | 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 J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| 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 dialing, Voice recorder, Voice commands |
| Camera | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Back camera (main camera) | 8 megapixels | (triple camera)
64 megapixels
8MP ultrawidef/2.2123º12mm1/4.0"1.12µm
5MP depthf/2.2 |
| Main camera resolution | 3264x2448 pixels | 10120x6328 pixels |
| Video recording (primary) | Full HD (1920x1080) 30 fps | 4K UHD (3840x2160) 30 fps |
| Flash | LED flash | LED flash |
| Focal aperture | f/1.9 (aperture) | f/1.8 (aperture) |
| Focal length | feature not registered | 26mm lens |
| Sensor size | feature not registered | 1/1.72" inches |
| Pixel size | feature not registered | 0.8µm pixel |
| Autofocus | Autofocus | PDAF: phase detection autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | EIS: Digital 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 only main camera | HDR photo on both cameras |
| 2ª camera | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Front camera (secondary) | 5 megapixels | 32 megapixels |
| Front camera resolution | 2560x1920 pixels | 6528x4896 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 | 26mm lens |
| Sensor size | feature not registered | 1/2.8" inches |
| Pixel size | feature not registered | 0.8µm pixel |
| Multimedia | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Radio | FM | FM (RDS) |
| TV | Not supported | Not supported |
| Video formats | MP4, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263, XviD, MKV |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
| Connectivity | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| USB | MicroUSB 2.0 | USB 2.0 Type-C reversible connector |
| TV output | Not supported | Not supported |
| Audio output | 3.5mm jack | 3.5mm jack |
| Bluetooth | 4.2 + A2DP | 5.0 + A2DP/LE |
| WiFi | 802.11 b/g/n (2.4Ghz) | 802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO |
| DLNA | Not supported | Not supported |
| NFC | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
| Infrared port | Not supported | Not supported |
| Other functions | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Active noise cancellation | Not 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
| Accelerometer
Compass
Ambient Light sensor
Gyroscope
Face unlock
Fingerprint sensor (rear-mounted)
|
| Other features | - Colors: Black
- WiFi direct, hotspot | - Colors: Black, Blue
- One UI 2.5
- Stereo sound not supported
- DeX not supported
- WiFi direct, hotspot |
| Power supply | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| Battery | Li-Ion: Lithium-Ion (Removable) | LiPo: Li-Ion polymer (Non removable) |
| Battery capacity | 2600 mAh | 6000 mAh |
| Charger, watts | Standard charging | 15W Fast battery charging |
| Talk time autonomy | feature not registered | 2880 minutes | 48 hours | 2 days |
| Standby | feature not registered | feature not registered |
| Radiation rate | Samsung Galaxy J3 2018 (SM-J337U) | Samsung Galaxy M21s (SM-F415F/DS) |
| SAR 1.6W/kg (USA, Mexico, etc.) | 1.2W/kg (head) | 1.58W/kg (body) | 0.383W/kg (head) |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |