Phone Comparison - Microsoft Lumia 640 XL vs Microsoft Lumia 540 Dual SIM vs Xiaomi Mi 4i
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| Manufacturer | Microsoft | Microsoft | Xiaomi |
| Announced | March 2015 | April 2015 | April 2015 |
| Status | Available - April 2015 | Available - May 2015 | Available - April 2015 |
| Price | Rs. 12,999 ($191.16) [Similarly Priced] | Rs. 8,100 ($119.12) [Similarly Priced] | Rs. 8,999 ($132.34) [Similarly Priced] |
| Colors | Matte cyan, Orange, Black, Matte white, Glossy white | Orange, white, black, cyan | Black, White, Blue, Yellow, Pink |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
157.9 x 81.5 x 9 mm (6.22 x 3.21 x 0.35 in) |
144 x 73.7 x 9.4 mm (5.67 x 2.9 x 0.37 in) |
138.1 x 69.6 x 7.8 mm (5.44 x 2.74 x 0.31 in) |
| Weight | 171 g (6.03 oz) | 152 g (5.36 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 900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | - | - | LTE |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM |
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| OS | Microsoft Windows Phone 8.1 with Lumia Denim | Microsoft Windows Phone 8.1 with Lumia Denim | Android OS, v5.0 (Lollipop) |
| Processor | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 200 | Quad-core 1.7 GHz Cortex-A53 & quad-core 1.0 GHz Cortex-A53, Qualcomm MSM8939 Snapdragon 615 |
| GPU | Adreno 305 | Adreno 302 | Adreno 405 |
| RAM | 1 GB | 1 GB | 2 GB |
| Internal Memory | 8 GB | 8 GB | 16/32 GB |
| External Memory | microSD, up to 128 GB | microSD, up to 128 GB | No |
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| Type | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3, ClearBlack Display | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.7 inches | 5.0 inches | 5.0 inches |
| Resolution | 720 x 1280 pixels (259 ppi) | 720 x 1280 pixels (294 ppi) | 1080 x 1920 pixels (441 ppi) |
| Screen-to-Body Ratio | 68.88% | 64.82% | 71.57% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 13 MP, 4128 x 3096 pixels | 8 MP, 3264 x 2448 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | LED flash | LED flash | LED flash |
| Features | Auto focus, Carl Zeiss Optics, 1/3'' Sensor Size | Auto focus, Sensor size: 1/4 inch, f/2.2 aperture | Auto focus, Geo-tagging, Touch Focus, Face/smile Detection, Panorama, HDR |
| Video | 1080p@30fps | 480p@30fps | 1080p@30fps |
| Front Camera | 5 MP, 1080p [Similar] | 5 MP [Similar] | 5 MP [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Up to 236 kbps | Yes |
| 3G | HSPA 42.2/5.76 Mbps | HSPA 42.2/5.76 Mbps | HSPA, LTE |
| Bluetooth | v4.0, A2DP | v4.0, A2DP | v4.0, A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n, DLNA, hotspot | Wi-Fi 802.11 b/g/n, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n, dual-band, hotspot |
| USB | microUSB v2.0 | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS, GLONASS, Beidou | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 8 GB, 1 GB RAM | 8 GB, 1 GB RAM | 16/32 GB, 2 GB RAM |
| Expandable Storage | microSD, up to 128 GB | 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 | Li-Ion Battery | Li-Ion Battery | Li-Po Battery |
| Capacity | 3000 mAh | 2200 mAh | 3120 mAh |
| Stand by | Up to 936 h (2G) Up to 936 h (3G) |
Up to 576 h | - |
| Talk Time | Up to 31 h 20 min (2G) Up to 23 h 40 min (3G) |
Up to 26.2 h (2G) Up to 14.8 h (3G) |
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