Samsung Galaxy S II vs Samsung Galaxy A9
| Type | Touch | Touch |
| Dimensions | 125.30 x 66.10 x 8.49 mm | 162.50 x 77.00 x 7.80 mm |
| Weight | 116.00 g | 183.00 g |
| Display size | 4.27" | 6.30" |
| Display | Color / Super AMOLED Plus 16M colors 480 x 800 px (4.27") 218 ppi | Color / Super AMOLED 16M colors 1080 x 2220 px (6.30") 392 ppi |
| Display protection | Corning Gorilla Glass Buy screen protector
 | Corning Gorilla Glass Buy screen protector
|
| Additional display |  | |
| Protection of the secondary display | | |
| Talk time (max.) | 2G: 1100 min. (18.3 h) 3G: 520 min. (8.7 h) |  |
| Video talk time (max.) | 220 min. (3.7 h) | nd |
| Stand-by (max.) | 2G: 710 h. (29.6 days) 3G: 610 h. (25.4 days) | |
| Standard battery | Li-Po 1650 mAhBuy powerbank
| Li-Ion 3800 mAhBuy powerbank
|
| Quick battery charging | | Fast Charging |
| Wireless battery charging | | |
| Internal memory | 16 GB | 128 GB |
| RAM memory | 1 GB | 6 GB, 8 GB |
| Memory cards |  microSD, microSDHC up to 32 GBBuy memory card | microSD, microSDHC, microSDXC up to 512 GBBuy memory card |
| Operating system | Android 2.3 Gingerbread | Android 8.0 Oreo |
| Interface | TouchWiz 4.0 | - |
| Processor | Samsung Exynos 4210 | Qualcomm Snapdragon 660 |
| Processor clock | 1200 MHz | 2200 MHz |
| GPU | ARM Mali-400 MP4 @266 MHz | Adreno 512 |
| Touchscreen | | |
| DualSIM | | |
| DualSIM mode | nd | dual standby |
| Hybrid DualSIM | nd | |
| Announced | 1Q 2011 | 4Q 2018 |
| Other names | GT-i9100; GT-i9100p; Galaxy S2; Galaxy S II 4G | SM-A920F; Galaxy A9 2018 |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 1900 2100 |
| LTE standard | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Photo sensor model | Samsung S5K3H2 | |
| Photo matrix | 8 Mpx | 24 Mpx |
| Resolution | 3264x2448 px | |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 1920x1080 px | |
| Video formats | H.263, H.264 - 30 fps | |
| Additional | - | AF, f/1.7 |
| Second camera | | |
| Photo matrix | nd | 10 Mpx |
| Optical zoom | nd | 2x |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Additional | nd | AF, f/2.4 |
| Third camera | | |
| Photo matrix | nd | 8 Mpx |
| Optical zoom | nd | |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Additional | nd | FF, f/2.4 |
| Fourth camera | | |
| Photo matrix | nd | 5 Mpx |
| Optical zoom | nd | |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Additional | nd | FF, f/2.2 |
CAMERAS - FRONT
| First camera | | |
| Photo sensor model | Samsung S5K5BAF | |
| Photo matrix | 2 Mpx | 24 Mpx |
| Resolution | 1600x1200 px | |
| Optical zoom | | |
| Flash | | |
| Dual-colour LED flash | | |
| Video formats | H.263, H.264 - 30 fps | |
| Additional | - | 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 | 21.00 Mbit/s | |
| HSUPA | 5.76 Mbit/s | |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | - |
| LTE UP | | 51.00 Mbit/s |
| WIMAX+ | | |
| GPRS | class 12 | |
| EDGE | class 12 | |
| Bluetooth | v3.0 | v5.0 LE |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n | v802.11 a/b/g/n/ac |
| WiFi frequencies | 2,4 GHz | 2,4 GHz; 5 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 | 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 | v1.2 | |
| Dictionary | XT9 | XT9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | z RDS | |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC, AAC+, AMR, FLAC, OGG, WAV, WMA, eAAC+ | 3GA, AAC, AMR, AWB, FLAC, IMY, M4A, MID, MIDI, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, WMA, XMF |
| Polyphony | 72 voices | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | Dalvik | 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 | | |