Phone Comparison - Nokia Lumia 820 vs Nokia Lumia 735 vs Nokia Lumia 638
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| Manufacturer | Nokia | Nokia | Nokia |
| Announced | Expected September 2012 | September 2014 | December 2014 |
| Status | Available - November 2012 | Available - September 2014 | Available - December 2014 |
| Price | - | - | Rs. 7,999 ($117.63) [Similarly Priced] |
| Colors | Black, Gray, Red, Yellow, White, Blue, Violet | Orange, green, white, black | Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
123.8 x 68.5 x 9.9 mm (4.87 x 2.7 x 0.39 in) |
134.7 x 68.5 x 8.9 mm (5.3 x 2.7 x 0.35 in) |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
| Weight | 160 g (5.64 oz) | 134 g (4.73 oz) | 136 g (4.8 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 / 1900 / 2100 |
| 4G Network | LTE 800 / 1800 / 2600 / 2100/ 900 | LTE 800 / 1800 / 2600 | LTE 1800 / 1900 / 2100 / 2300 / 2500 / 2600 (Bands 3, 7, 38, 39, 40, 41) |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
| Build Features | - | ClearBlack display | - |
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| OS | Microsoft Windows Phone 8 | Microsoft Windows Phone 8.1 | Microsoft Windows Phone 8.1 |
| 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 | 1 GB | 1 GB |
| Internal Memory | 8 GB storage | 8 GB | 8 GB |
| External Memory | microSD, up to 32 GB | microSD, up to 128 GB | microSD, up to 128 GB |
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| Type | AMOLED capacitive touchscreen | AMOLED Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD capacitive touchscreen, Corning Gorilla Glass 3, ClearBlack Display |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.3 inches | 4.7 inches | 4.5 inches |
| Resolution | 480 x 800 pixels (217 ppi) | 720 x 1280 pixels (312 ppi) | 480 x 854 pixels (218 ppi) |
| Screen-to-Body Ratio | 62.04% | 66.20% | 64.43% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264x2448 pixels, Carl Zeiss Tessa | 6.7 MP, Carl Zeiss optics | 5 MP, 2592 х 1944 pixels |
| Flash | LED flash | LED Flash | No |
| Features | Auto focus, Geo-tagging | 1/3.4'' sensor size, geo-tagging, face detection, panorama | Auto focus, 1/4 |
| Video | Yes | 1080p@30fps, stereo sound rec. | Yes |
| Front Camera | Yes [Similar] | 5 MP, 720p [Similar] | No [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Up to 296 kbps | Yes |
| 3G | HSDPA, 42 Mbps HSUPA, 5.76 Mbps LTE, Cat3, 50 Mbps UL, 100 Mbps DL |
HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps; LTE, Cat4, 50 Mbps UL, 150 Mbps DL | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Bluetooth | Yes, v3.1 with A2DP, EDR | v4.0, A2DP | v4.0, A2DP, LE/ apt-X after WP8 Denim update |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, DLNA, hotspot |
| USB | Yes, microUSB v2.0 | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS, GLONASS, Beidou | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 8 GB storage, 1 GB RAM | 8 GB, 1 GB RAM | 8 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 128 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 (BV-T5A) | Li-Ion Battery (BL-5H) |
| Capacity | 1650 mAh | 2200 mAh | 1830 mAh |
| Stand by | Up to 330 h (2G) Up to 330 h (3G) |
Up to 600 h | - |
| Talk Time | Up to 14 h (2G) Up to 8 h (3G) |
Up to 22 h (2G) Up to 17 h (3G) |
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