Phone Comparison - Nokia Lumia 820 vs Nokia Lumia 635 vs Microsoft Lumia 640 LTE
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| Manufacturer | Nokia | Nokia | Microsoft |
| Announced | Expected September 2012 | April 2014 | March 2015 |
| Status | Available - November 2012 | Available - May 2014 | Available - April 2015 |
| Price | - | - | Rs. 7,999 ($117.63) [Similarly Priced] |
| Colors | Black, Gray, Red, Yellow, White, Blue, Violet | Orange, Yellow, White, Black | Yes |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
123.8 x 68.5 x 9.9 mm (4.87 x 2.7 x 0.39 in) |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
141.3 x 72.2 x 8.8 mm (5.56 x 2.84 x 0.35 in) |
| Weight | 160 g (5.64 oz) | 134 g (4.73 oz) | 145 g (5.11 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | LTE 800 / 1800 / 2600 / 2100/ 900 | LTE | LTE |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Microsoft Windows Phone 8 | Microsoft Windows Phone 8.1 | Microsoft Windows Phone 8.1 with Lumia Denim |
| Processor | Dual-core 1.5 GHz Krait, Qualcomm MSM8960 Snapdragon | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 |
| GPU | Adreno 225 | Adreno 305 | Adreno 305 |
| RAM | 1 GB | 512 MB | 1 GB |
| Internal Memory | 8 GB storage | 8 GB | 8 GB |
| External Memory | microSD, up to 32 GB | microSD, up to 64 GB | microSD, up to 128 GB |
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| Type | AMOLED capacitive touchscreen | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3, ClearBlack Display |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.3 inches | 4.5 inches | 5.0 inches |
| Resolution | 480 x 800 pixels (217 ppi) | 480 x 854 pixels (218 ppi) | 720 x 1280 pixels (294 ppi) |
| Screen-to-Body Ratio | 62.04% | 64.43% | 67.43% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | No | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264x2448 pixels, Carl Zeiss Tessa | 5 MP, 2592 х 1944 pixels | 8 MP, 3264 x 2448 pixels |
| Flash | LED flash | No | LED flash |
| Features | Auto focus, Geo-tagging | Geo-tagging | Auto focus, 1/4'' Sensor Size |
| Video | Yes | Yes, 720p@30fps | 1080p@30fps |
| Front Camera | Yes [Similar] | No [Similar] | 1 MP, 720p [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 42 Mbps HSUPA, 5.76 Mbps LTE, Cat3, 50 Mbps UL, 100 Mbps DL |
HSDPA, 21 Mbps; HSUPA, 5.76 Mbps; LTE, Cat3, 50 Mbps UL, 100 Mbps DL | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Bluetooth | Yes, v3.1 with A2DP, EDR | Yes, v4.0 with A2DP | v4.0, A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, DLNA, hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support and GLONASS | Yes, with A-GPS, GLONASS, Beidou |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 8 GB storage, 1 GB RAM | 8 GB, 512 MB RAM | 8 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 64 GB | microSD, up to 128 GB |
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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-Ion Battery |
| Capacity | 1650 mAh | 1830 mAh | 2500 mAh |
| Stand by | Up to 330 h (2G) Up to 330 h (3G) |
Up to 648 h | Up to 864 h (2G) Up to 864 h (3G) |
| Talk Time | Up to 14 h (2G) Up to 8 h (3G) |
Up to 12 h (2G) Up to 14 h (3G) |
Up to 26 h 30 min (2G) Up to 17 h 30 min (3G) |
