| Physical features | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Model | Galaxy S2 Plus (GT-i9105) | Redmi 9 (128GB/6GB) |
| Other model names | Samsung Galaxy S ii Plus i9105, Samsung GT-i9105 | Xiaomi Redmi 9 M2004J19C |
| Country or region available | feature not registered | 
China |
| Brand | Samsung | Xiaomi |
| Release date | February, 2013 | June, 2020 |
| Depth | 8.5 millimeters (0.33 inches) | 9.1 millimeters (0.36 inches) |
| Size (width x height) | 66.1 x 125.3 millimeters (2.6 x 4.93 in) | 77.01 x 163.32 millimeters (3.03 x 6.43 in) |
| Weight | 121 grams (4.24 ounces) | 198 grams (6.93 ounces) |
| Qwerty physical keyboard | Not supported | Not supported |
| Antenna | Internal antenna | Internal antenna |
| Build, materials | feature not registered | Plastic body, glass front |
| Protection against water and others | Not supported | Not supported |
| System (OS) | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Operating system | Android 4.1.2 Jelly Bean | Android 10 |
| Firmware update | Android 4.2.2 Jelly Bean | feature not registered |
| Hardware | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Chipset | 32bit - Broadcom BCM28155 (40nm) | 64bit - Mediatek Helio G80 (12nm) |
| CPU processor | 1.2Ghz Dual-Core ARM Cortex-A9 | Octa-Core, 2 processors:
2Ghz Dual-Core ARM Cortex-A75
1.8Ghz Hexa-Core ARM Cortex-A55 |
| GPU graphical controller | Broadcom VideoCore IV | ARM Mali-G52 MC2 950Mhz |
| RAM memory | 1GB LPDDR2 | 6GB LPDDR4X |
| Internal storage | 8GB (5GB available) | 128GB (106GB available)
eMMC 5.1 |
| External storage | Until 64GB microSD, microSDXC
(dedicated slot) | Until 512GB microSD, microSDXC
(dedicated slot) |
| Display | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Display type | Super AMOLED Plus | TFT IPS LCD |
| Screen size | 4.3" inches | 6.53" inches |
| Screen-to-body ratio | ~63.5% (screen-to-body ratio) | ~83.2% (screen-to-body ratio) |
| Display resolution | 480x800 pixels | 1080x2340 pixels (19.5:9) |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 217 PPI | 395 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Not supported | Gorilla Glass 3 |
| Display features | feature not registered | 60Hz, 400 nits |
| Mobile networks | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Dual-SIM | Not supported | Dual-SIM Standby - Call active on one sim card
(dedicated slot) |
| SIM card | 1 slot (Single-SIM)
Standard mini-SIM (2FF) | 2 slots (Dual-SIM)
nano-SIM (4FF) |
| Maximum download/upload | 21/5.76 Mbps | 300/50 Mbps |
| Network technology | 2G, 3G | 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 850/900/1700/1900/2100 |
| Primary 4G network | Not supported | LTE Cat6 (1, 2, 3, 4, 5, 7, 8, 20, 28)
TD-LTE (38, 40, 41)
VoLTE |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+ | 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 S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Messaging | SMS (Swype), 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, Voice commands |
| Camera | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Back camera (main camera) | 8 megapixels | (quad camera)
13 megapixels
8MP ultrawidef/2.2118º1/4.0"1.12µm
5MP macrof/2.4
2MP depthf/2.4 |
| Main camera resolution | 3264x2448 pixels | 4128x3096 pixels |
| Video recording (primary) | Full HD (1920x1080) 30 fps | Full HD (1920x1080) 30 fps |
| Flash | LED flash | LED flash |
| Focal aperture | f/2.6 (aperture) | f/2.2 (aperture) |
| Focal length | feature not registered | 28mm lens |
| Sensor size | 1/3.2" inches | 1/3.1" inches |
| Pixel size | feature not registered | 1.12µm 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 | Not supported | HDR photo on both cameras |
| 2ª camera | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Front camera (secondary) | 2 megapixels | 8 megapixels |
| Front camera resolution | 1600x1200 pixels | 3264x2448 pixels |
| Video recording (secondary) | Not supported | Full HD (1920x1080) |
| Front flash | Not supported | Not supported |
| Focal aperture | feature not registered | f/2.0 (aperture) |
| Focal length | feature not registered | 27mm lens |
| Sensor size | feature not registered | 1/4" inches |
| Pixel size | feature not registered | 1.12µm pixel |
| Multimedia | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Radio | FM (RDS) | FM |
| TV | Not supported | Not supported |
| Video formats | MP4, H.264, H.263, DivX, XviD, WMV | MP4, H.265, H.264, H.263, XviD, MKV |
| Audio formats | MP3, WAV, eAAC+, AC3, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
| Connectivity | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| USB | MicroUSB 2.0 | USB 2.0 Type-C, USB OTG On-The-Go |
| TV output | Micro-B USB MHL | USB Type-C (reversible) |
| Audio output | 3.5mm jack | 3.5mm jack |
| Bluetooth | 3.0 + A2DP | 5.0 + A2DP/LE |
| WiFi | 802.11 a/b/g/n (2.4Ghz, 5Ghz) + MIMO | 802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO |
| DLNA | Supported | Not supported |
| NFC | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS, BeiDou |
| Infrared port | Not supported | Supported |
| Other functions | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| 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
Ambient Light sensor
Gyroscope
| Accelerometer
Proximity sensor
Compass
Ambient Light sensor
Face unlock
Fingerprint sensor (rear-mounted)
|
| Other features | - Colors: Chic White, Dark Blue
- Samsung TouchWiz UI 5.0
- WiFi direct, hotspot | - Colors: Carbon Gray, Sunset Purple, Ocean Green, Pink/Blue
- MIUI 11
- 10W charger included
- WiFi direct, hotspot
- AnTuTu: 201829 (v8) |
| Power supply | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| Battery | Li-Ion: Lithium-Ion (Removable) | LiPo: Li-Ion polymer (Non removable) |
| Battery capacity | 1650 mAh | 5020 mAh |
| Charger, watts | Standard charging | 18W Fast battery charging |
| Talk time autonomy | feature not registered | 1860 minutes | 31 hours | 1.3 days |
| Standby | feature not registered | feature not registered |
| Radiation rate | Samsung Galaxy S2 Plus (GT-i9105) | Xiaomi Redmi 9 (128GB/6GB) |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | 0.91W/kg (head) | 1W/kg (body) |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | 0.71W/kg (head) | 1.06W/kg (body) |