Phone Comparison - Apple iPhone 4S vs Microsoft Lumia 640 LTE vs Xiaomi Mi 4i
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| Manufacturer | Apple | Microsoft | Xiaomi |
| Announced | October 2011 | March 2015 | April 2015 |
| Status | Available - October 2011 | Available - April 2015 | Available - April 2015 |
| Price | - | Rs. 7,999 ($117.63) [Similarly Priced] | Rs. 8,999 ($132.34) [Similarly Priced] |
| Colors | Black, White | Yes | Black, White, Blue, Yellow, Pink |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
115.2 x 58.6 x 9.3 mm (4.54 x 2.31 x 0.37 in) |
141.3 x 72.2 x 8.8 mm (5.56 x 2.84 x 0.35 in) |
138.1 x 69.6 x 7.8 mm (5.44 x 2.74 x 0.31 in) |
| Weight | 140 g (4.94 oz) | 145 g (5.11 oz) | 130 g (4.59 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 CDMA2000 1xEV-DO |
GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | - | LTE | LTE |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM |
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| OS | iOS 5 | Microsoft Windows Phone 8.1 with Lumia Denim | Android OS, v5.0 (Lollipop) |
| Processor | 1 GHz dual-core ARM Cortex-A9 processor, Apple A5 chipset | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.7 GHz Cortex-A53 & quad-core 1.0 GHz Cortex-A53, Qualcomm MSM8939 Snapdragon 615 |
| GPU | PowerVR SGX543MP2 | Adreno 305 | Adreno 405 |
| RAM | 512 MB | 1 GB | 2 GB |
| Internal Memory | 16/32/64 GB storage | 8 GB | 16/32 GB |
| External Memory | No | microSD, up to 128 GB | No |
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| Type | LED-backlit IPS TFT | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3, ClearBlack Display | IPS LCD capacitive touchscreen |
| Colors | capacitive touchscreen | 16M colors | 16M colors |
| Size | 3.5 inches | 5.0 inches | 5.0 inches |
| Resolution | 640 x 960 pixels (330 ppi) | 720 x 1280 pixels (294 ppi) | 1080 x 1920 pixels (441 ppi) |
| Screen-to-Body Ratio | 53.92% | 67.43% | 71.57% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | FM radio | FM radio |
| Games | Downloadable, incl. motion-bas | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264x2448 pixels | 8 MP, 3264 x 2448 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | LED flash | LED flash | LED flash |
| Features | Auto focus, Touch Focus, Geo-tagging, Face Detection, HDR | Auto focus, 1/4'' Sensor Size | Auto focus, Geo-tagging, Touch Focus, Face/smile Detection, Panorama, HDR |
| Video | Yes, 1080p@30fps, LED video light, video stabilization, geo-tagging | 1080p@30fps | 1080p@30fps |
| Front Camera | Yes, VGA [Similar] | 1 MP, 720p [Similar] | 5 MP [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 14.4 Mbps; HSUPA, 5.8 Mbps | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps | HSPA, LTE |
| Bluetooth | Yes, v4.0 with A2DP | v4.0, A2DP | v4.0, A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, DLNA, hotspot | Wi-Fi 802.11 a/b/g/n, dual-band, hotspot |
| USB | Yes, v2.0 | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support and GLONASS | Yes, with A-GPS, GLONASS, Beidou | Yes, with A-GPS, GLONASS |
| Browser | HTML (Safari) | HTML5 | HTML5 |
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| Call Records | 100 received, dialed and missed calls | Practically unlimited | Practically unlimited |
| Internal | 16/32/64 GB storage, 512 MB RAM | 8 GB, 1 GB RAM | 16/32 GB, 2 GB RAM |
| Expandable Storage | No | microSD, up to 128 GB | No |
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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-Po | Li-Ion Battery | Li-Po Battery |
| Capacity | 1432 mAh | 2500 mAh | 3120 mAh |
| Stand by | Up to 200 h (2G) Up to 200 h (3G) |
Up to 864 h (2G) Up to 864 h (3G) |
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| Talk Time | Up to 14 h (2G) Up to 8 h (3G) |
Up to 26 h 30 min (2G) Up to 17 h 30 min (3G) |
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