Phone Comparison - Xiaomi Redmi Note 4G vs Nokia Lumia 638 vs Xiaomi Redmi 2
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| Manufacturer | Xiaomi | Nokia | Xiaomi |
| Announced | August 2014 | December 2014 | January 2015 |
| Status | Available - November 2014 | Available - December 2014 | Available - January 2015 |
| Price | - | Rs. 7,999 ($117.63) [Similarly Priced] | Rs. 5,999 ($88.22) [Similarly Priced] |
| Colors | Black/White | Black | Black, White, Yellow, Pink, Green |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
154 x 78.7 x 9.5 mm (6.06 x 3.1 x 0.37 in) |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
134 x 67.2 x 9.4 mm (5.28 x 2.65 x 0.37 in) |
| Weight | 199 g (7.02 oz) | 136 g (4.8 oz) | 133 g (4.69 oz) |
| 2G Network | GSM 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | TD-SCDMA 1900 / 2000 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 1900 / 2100 TD-SCDMA 1900 / 2100 |
| 4G Network | TD-LTE 1900 / 2300 / 2600 | LTE 1800 / 1900 / 2100 / 2300 / 2500 / 2600 (Bands 3, 7, 38, 39, 40, 41) | LTE 1800 / 2600 TD-LTE 1900 / 2300 / 2500 / 2600 (Bands 3, 7, 38, 39, 40, 41) |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM |
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| OS | Android OS, v4.2 (Jelly Bean) | Microsoft Windows Phone 8.1 | Android OS, v4.4 (KitKat) |
| Processor | Quad-core 1.6 GHz Cortex-A7, Qualcomm MSM8928 Snapdragon 400 | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.2 GHz Cortex-A53, Qualcomm MSM8916 Snapdragon 410 |
| GPU | Adreno 305 | Adreno 305 | Adreno 306 |
| RAM | 2 GB | 1 GB | 1 GB |
| Internal Memory | 8 GB | 8 GB | 8 GB |
| External Memory | microSD, up to 64 GB | microSD, up to 128 GB | microSD, up to 32 GB |
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| Type | IPS LCD capacitive touchscreen | IPS LCD capacitive touchscreen, Corning Gorilla Glass 3, ClearBlack Display | IPS LCD Capacitive Touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.5 inches | 4.5 inches | 4.7 inches |
| Resolution | 720 x 1280 pixels (267 ppi) | 480 x 854 pixels (218 ppi) | 720 x 1280 pixels (312 ppi) |
| Screen-to-Body Ratio | 68.82% | 64.43% | 67.83% |
| 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 | 5 MP, 2592 х 1944 pixels | 8 MP, 3264 x 2448 pixels |
| Flash | LED flash | No | LED flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face And Smile Detection, HDR | Auto focus, 1/4 | Auto focus, Geo-tagging, Touch Focus, Face Detection, HDR, Sony Sensor, Panorama, Real-time HDR |
| Video | 1080p@30fps | Yes | Yes, 1080p |
| Front Camera | 5 MP [Similar] | No [Similar] | 2 MP, 720p [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | TD-SCDMA; LTE | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps | HSPA, LTE Cat4 150/50 Mbps |
| Bluetooth | v4.0, A2DP, LE | v4.0, A2DP, LE/ apt-X after WP8 Denim update | v4.0, A2DP |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, DLNA, hotspot | Wi-Fi 802.11 b/g/n, hotspot |
| USB | microUSB v2.0, USB On-the-go | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS, Beidou |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 8 GB, 2 GB RAM | 8 GB, 1 GB RAM | 8 GB, 1 GB RAM / 16 GB, 2 GB RAM |
| Expandable Storage | microSD, up to 64 GB | microSD, up to 128 GB | microSD, up to 32 GB |
| 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 | Li-Po Battery | Li-Ion Battery (BL-5H) | Li-Po Battery |
| Capacity | 3200 mAh | 1830 mAh | 2200 mAh |
| Stand by | Up to 775 h (3G) | - | - |
| Talk Time | Up to 38 h (2G) Up to 14 h (3G) |
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