Phone Comparison - Samsung I9100 Galaxy S II vs Microsoft Lumia 640 Dual SIM vs Xiaomi Redmi 3 Pro
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| Manufacturer | Samsung | Microsoft | Xiaomi |
| Announced | February 2011 | March 2015 | March 2016 |
| Status | Available - April 2011 | Available - April 2015 | Available - April 2016 |
| Price | - | Rs. 8,999 ($132.34) [Similarly Priced] | - |
| Colors | Black, White, Pink | Yes | Dark Gray, Silver, Gold |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
125.3 x 66.1 x 8.5 mm (4.93 x 2.6 x 0.33 in) |
141.3 x 72.2 x 8.8 mm (5.56 x 2.84 x 0.35 in) |
139.3 x 69.6 x 8.5 mm (5.48 x 2.74 x 0.33 in) |
| Weight | 116 g (4.09 oz) | 145 g (5.11 oz) | 144 g (5.08 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA2000 1xEV-DO |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 1900 / 2100 |
| 4G Network | - | - | LTE band 1(2100), 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) |
| Messaging | SMS, MMS, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM |
| Build Features | - | - | - Fingerprint Sensor |
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| OS | Android OS, v2.3 (Gingerbread), planned upgrade to v4.0 | Microsoft Windows Phone 8.1 with Lumia Denim | Android OS, v5.1 (Lollipop) |
| Processor | Dual-core 1.2GHz ARM Cortex-A9 processor, Exynos chipset | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.5 GHz Cortex-A53 & quad-core 1.2 GHz Cortex-A53, Qualcomm MSM8939v2 Snapdragon 616 |
| GPU | Mali-400MP | Adreno 305 | Adreno 405 |
| RAM | 1 GB | 1 GB | 3 GB |
| Internal Memory | 16 GB/32 GB storage | 8 GB | 32 GB |
| External Memory | microSD, up to 32GB, 8 GB included | microSD, up to 128 GB | microSD, up to 128 GB (uses SIM 2 slot) |
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| Type | Super AMOLED Plus capacitive touchscreen | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3, ClearBlack Display | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.3 inches | 5.0 inches | 5.0 inches |
| Resolution | 480 x 800 pixels (217 ppi) | 720 x 1280 pixels (294 ppi) | 720 x 1280 pixels (294 ppi) |
| Screen-to-Body Ratio | 63.52% | 67.43% | 70.95% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | Stereo FM radio with RDS | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264x2448 pixels | 8 MP, 3264 x 2448 pixels | 13 MP, 4160 x 3120 pixels |
| Flash | LED flash | LED flash | LED Flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face And Smile Detection, Image Stabilization | Auto focus, 1/4'' Sensor Size | Phase Detection Autofocus, f/2.0, Geo-tagging, Touch Focus, Face/smile Detection, HDR, Panorama |
| Video | Yes, 1080p@30fps | 1080p@30fps | 1080p@30fps |
| Front Camera | Yes, 2 MP [Similar] | 1 MP, 720p [Similar] | 5 MP, f/2.2, 1080p@30fps [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 | HSPA 42.2/5.76 Mbps | HSPA, LTE, EV-DO Rev.A 3.1 Mbps |
| Bluetooth | Yes, v3.0+HS | v4.0, A2DP | v4.1, A2DP |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, DLNA, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, DLNA, hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, 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, BDS |
| Browser | HTML | HTML5 | HTML5 |
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| Internal | 16GB/32GB storage, 1 GB RAM | 8 GB, 1 GB RAM | 32 GB, 3 GB RAM |
| Expandable Storage | microSD, up to 32GB, 8 GB included | microSD, up to 128 GB | microSD, up to 128 GB (uses SIM 2 slot) |
| 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 | Non-removable Li-Ion Battery |
| Capacity | 1650 mAh | 2500 mAh | 4100 mAh |
| Stand by | Up to 710 h (2G) Up to 610 h (3G) |
Up to 840 h (2G) Up to 840 h (3G) |
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| Talk Time | Up to 18 h 20 min (2G) Up to 8 h 40 min (3G) |
Up to 27 h 30 min (2G) Up to 20 h 30 min (3G) |
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