Phone Comparison - Samsung I9100 Galaxy S II vs Samsung Galaxy Alpha (S801) vs Xiaomi Mi 4i
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| Manufacturer | Samsung | Samsung | Xiaomi |
| Announced | February 2011 | August 2014 | April 2015 |
| Status | Available - April 2011 | Available - September 2014 | Available - April 2015 |
| Price | - | - | Rs. 8,999 ($132.34) [Similarly Priced] |
| Colors | Black, White, Pink | Charcoal Black, Sleek Silver, Dazzling White, Frosted Gold, Scub | Black, White, Blue, Yellow, Pink |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
125.3 x 66.1 x 8.5 mm (4.93 x 2.6 x 0.33 in) |
132.4 x 65.5 x 6.7 mm (5.21 x 2.58 x 0.26 in) |
138.1 x 69.6 x 7.8 mm (5.44 x 2.74 x 0.31 in) |
| Weight | 116 g (4.09 oz) | 115 g (4.06 oz) | 130 g (4.59 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | - | LTE | LTE |
| Messaging | SMS, MMS, IM | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM |
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| OS | Android OS, v2.3 (Gingerbread), planned upgrade to v4.0 | Android OS, v4.4.4 (KitKat) | Android OS, v5.0 (Lollipop) |
| Processor | Dual-core 1.2GHz ARM Cortex-A9 processor, Exynos chipset | Quad-core 2.5 GHz Krait 400, Qualcomm MSM8974AC Snapdragon 801 | Quad-core 1.7 GHz Cortex-A53 & quad-core 1.0 GHz Cortex-A53, Qualcomm MSM8939 Snapdragon 615 |
| GPU | Mali-400MP | Adreno 330 | Adreno 405 |
| RAM | 1 GB | 2 GB | 2 GB |
| Internal Memory | 16 GB/32 GB storage | 32 GB | 16/32 GB |
| External Memory | microSD, up to 32GB, 8 GB included | No | No |
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| Type | Super AMOLED Plus capacitive touchscreen | Super AMOLED capacitive touchscreen | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.3 inches | 4.7 inches | 5.0 inches |
| Resolution | 480 x 800 pixels (217 ppi) | 720 x 1280 pixels (312 ppi) | 1080 x 1920 pixels (441 ppi) |
| Screen-to-Body Ratio | 63.52% | 70.43% | 71.57% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | Stereo FM radio with RDS | No | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264x2448 pixels | 12 MP, 4128 x 3096 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | LED flash | LED flash | LED flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face And Smile Detection, Image Stabilization | Auto focus, Dual Camera, Geo-tagging, Touch Focus, Face And Smile Detection, Panorama, HDR | Auto focus, Geo-tagging, Touch Focus, Face/smile Detection, Panorama, HDR |
| Video | Yes, 1080p@30fps | 2160p@30fps, 1080p@60fps, 720p@120fps | 1080p@30fps |
| Front Camera | Yes, 2 MP [Similar] | 2.1 MP [Similar] | 5 MP [Similar] |
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| GPRS | Class 12 (4+1/3+2/2+3/1+4 slots), 32 - 48 kbps | Yes | Yes |
| Edge | Class 12 | Yes | Yes |
| 3G | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps | HSDPA, 42 Mbps, HSUPA; LTE-A, Cat6, 300 Mbps DL, 50 Mbps UL | HSPA, LTE |
| Bluetooth | Yes, v3.0+HS | v4.0, A2DP, EDR, LE | v4.0, A2DP |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, DLNA, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n, dual-band, hotspot |
| USB | Yes, v2.0 microUSB (MHL), USB On-the-go | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS, GLONASS, Beidou | Yes, with A-GPS, GLONASS |
| Browser | HTML | HTML5 | HTML5 |
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| Internal | 16GB/32GB storage, 1 GB RAM | 32 GB, 2 GB RAM | 16/32 GB, 2 GB RAM |
| Expandable Storage | microSD, up to 32GB, 8 GB included | No | No |
| USB OTG | Supported | - | - |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| NFC | |
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| Type | Standard battery, Li-Ion | Li-Ion Battery | Li-Po Battery |
| Capacity | 1650 mAh | 1860 mAh | 3120 mAh |
| Stand by | Up to 710 h (2G) Up to 610 h (3G) |
- | - |
| Talk Time | Up to 18 h 20 min (2G) Up to 8 h 40 min (3G) |
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