Samsung Galaxy J7 Duo (SM-J720M) vs Samsung Galaxy S2 (SGH-i777 16GB)
Side by side comparison between Samsung Galaxy J7 Duo vs Samsung Galaxy S2 (SGH-i777) phones, differences, pros, cons and full specifications. What's the better?
,
5.5"
AMOLED
AMOLED
720x1280
13
MP
MP
8mp
3GB
RAM
RAM
Octa-core
3000
mAh
mAh
(Removable)
vs
4.3"
AMOLED
AMOLED
480x800
8
MP
MP
2mp
1GB
RAM
RAM
Dual-core
1650
mAh
mAh
(Removable)
What's the better phone? Samsung Galaxy J7 Duo (SM-J720M)
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!
23 Advantages 
6 Advantages | 18 Common items in both devices |
| Plastic body, glass front |
| Super AMOLED / Super AMOLED Plus |
| 16 million |
| Only digital zoom |
| Autofocus |
| EIS: Digital stabilization |
| Full HD (1920x1080) |
| +11 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 | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Model | Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) |
| Other model names | Galaxy J7 Duo J720M Single-Sim, Samsung J720 | AT&T Samsung Galaxy S II i777, Samsung Attain |
| Country or region available |  (Latin America) |  USA |
| Brand | Samsung | Samsung |
| Release date | 4/1/2018 | 10/2/2011 |
| Depth | 8.2 millimeters (0.32 inches) | 8.9 millimeters (0.35 inches) |
| Size (width x height) | 77.2 x 153.5 millimeters (3.04 x 6.04 in) | 66 x 126 millimeters (2.6 x 4.96 in) |
| Weight | 174 grams (6.09 ounces) | 122 grams (4.27 ounces) |
| Build, materials | Plastic body, glass front | Plastic body, glass front |
| Protection against water and others | Not supported | Not supported |
📲 Display | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Display type | Super AMOLED | Super AMOLED Plus |
| Screen size | 5.5" inches | 4.3" inches |
| Screen-to-body ratio | ~70.4% (screen-to-body ratio) | ~63.3% (screen-to-body ratio) |
| Display resolution | 720x1280 pixels (16:9) | 480x800 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 267 PPI | 217 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Not supported | Gorilla Glass |
| Refresh rate | 60Hz | feature not registered |
| Display features | Not supported | feature not registered |
🤖 Operating System | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| System version | Android 8.0 Oreo | Android 2.3.4 Gingerbread |
| Firmware update | Android 10 | Android 2.3.6 Gingerbread |
| User Interface | One UI 2.0 | feature not registered |
⚙️ Processor | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Chipset | 64bit: Samsung Exynos 7885 (14nm) | 32bit: Samsung Exynos 4 Dual 4210 (45nm) |
| CPU | Octa-core, 2 processors: 2x 2.2GHz ARM Cortex-A73 (Dual-core) 6x 1.6GHz ARM Cortex-A53 (Hexa-core) | Dual-core, 1 processor: 2x 1.2GHz ARM Cortex-A9 (Dual-core) |
| GPU graphical controller | ARM Mali-G71 MP2 | ARM Mali-400 MP4 |
| Performance (benchmark) | AnTuTu: 98104 (v7) | feature not registered |
💽 Memory and storage | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| RAM memory | 3GB LPDDR4 | 1GB LPDDR2 |
| Internal storage | 32GB (21GB available) eMMC 5.1 | 16GB (13GB available) |
| External storage | Until 256GB microSD, microSDXC (dedicated slot) | Until 32GB microSD, microSDHC (dedicated slot) |
📶 Mobile networks | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Dual-SIM | Not supported | Not supported |
| SIM card | 1 slot (Single-SIM) micro-SIM (3FF) | 1 slot (Single-SIM) Standard mini-SIM (2FF) |
| Maximum Download / Upload | 150/50 Mbps | 21/5.76 Mbps |
| Network technology | 2G, 3G, 4G | 2G, 3G |
| 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 | UMTS 850/900/1700/1900/2100 | UMTS 850/1900/2100 |
| Primary 4G network | LTE Cat4 (1, 3, 4, 5, 7, 8, 12, 13, 17, 28, 66) TD-LTE (38, 40, 41) | Not supported |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+ |
| Secondary 2G network | Not supported | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | Not supported |
📷 Camera | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Back camera (main camera) | (dual camera) 13 megapixels 5MP depth f/1.9 | 8 megapixels |
| Main camera resolution | 4128x3096 pixels | 3264x2448 pixels |
| Video recording (primary) | Full HD (1920x1080) 30 fps | Full HD (1920x1080) 30 fps |
| Flash | LED flash on both cameras | LED flash |
| Focal aperture | f/1.9 (aperture) | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Autofocus | Autofocus | 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 |
| BSI sensor | Not supported | Not supported |
| HDR | HDR photo only main camera | Not supported |
| Camera extras | feature not registered | feature not registered |
📸 Front camera | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Front camera (secondary) | 8 megapixels | 2 megapixels |
| Front camera resolution | 3264x2448 pixels | 1600x1200 pixels |
| Video recording (secondary) | Full HD (1920x1080) | Not supported |
| Front flash | LED | Not supported |
| Focal aperture | f/1.9 (aperture) | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
🔉 Sound and multimedia | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Loudspeaker | Mono sound (not stereo) | Supported |
| Active noise cancellation | Not supported | 2 microphones or more |
| Radio | FM | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4, H.264, H.263, XviD, MKV | MP4, H.264, H.263, XviD |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| USB | MicroUSB 2.0 | MicroUSB 2.0, USB OTG On-The-Go |
| Audio output | 3.5mm jack | 3.5mm jack |
| TV output | Not supported | Micro-B USB MHL |
| Bluetooth | 5.0 + A2DP/LE | 3.0 + A2DP |
| WiFi | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot | 802.11 a/b/g/n [wifi4] (2.4GHz, 5GHz) WiFi Direct, hotspot |
| DLNA | Not supported | feature not registered |
| GPS | A-GPS, GeoTagging, GLONASS, BeiDou | A-GPS, GeoTagging |
| NFC | Not supported | Not supported |
| Infrared port | Not supported | feature not registered |
🧭 Sensors | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Sensors | Accelerometer ANT+ Face unlock 2D Fingerprint sensor (front-mounted) Proximity sensor | Accelerometer Ambient light sensor Compass Gyroscope Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Battery type | Li-Ion: lithium-ion (Removable) | Li-Ion: lithium-ion (Removable) |
| Battery capacity | 3000 mAh | 1650 mAh |
| Charger, watts | Wired charging | Wired charging |
| Inductive / wireless charging | Not supported | feature not registered |
| Talk time autonomy | 20 hours | 8 hours |
| Standby | feature not registered | 400 hours (16.7 days) |
➕ Other features | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| Call control | Voice dialing, Voice recorder | Voice dialing, Voice recorder, Voice commands |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (Swype), 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, Flash player |
| Antenna | Internal antenna | Internal antenna |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | • Colors: Black, Gold, Rose Gold, White • Samsung Pay | • Colors: Black • Samsung TouchWiz 4.0 UI • Java framework |
☢️ Radiation rate | ||
| Galaxy J7 Duo (SM-J720M) | Galaxy S2 (SGH-i777 16GB) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | 0.97W/kg (head), 0.55W/kg (body) | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |