Phone Comparison - Panasonic P51 vs Oppo R819 vs Lenovo S820
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| Manufacturer | Panasonic | Oppo | Lenovo |
| Announced | May 2013 | August 2013 | May 2013 |
| Status | Available - May 2013 | Available - September 2013 | Available - May 2013 |
| Colors | Black, White | White | Flamingo red |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
144 x 75 x 8.5 mm (5.67 x 2.95 x 0.33 in) |
136.5 x 68 x 7.3 mm (5.37 x 2.68 x 0.29 in) |
139.5 x 69.7 x 9 mm (5.49 x 2.74 x 0.35 in) |
| Weight | 135 g (4.76 oz) | 110 g (3.88 oz) | 143 g (5.04 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 / 1900 |
| 3G Network | HSDPA 900 / 2100 | HSDPA 850 / 900 / 2100 - SIM 1 & SIM 2 | HSDPA 900 / 2100 |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail | SMS, MMS, EMail, IM |
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| OS | Android OS, v4.2 (Jelly Bean) | Android OS, v4.2.1 (Jelly Bean) | Android OS, v4.2 (Jelly Bean) |
| Processor | Quad-core 1.2 GHz Cortex-A7, MTK MT6589 | Quad-core 1.2 GHz, MediaTek MT6589 | Quad-core 1.2 GHz, MTK 6589W |
| GPU | PowerVR SGX544 | PowerVR SGX544 | PowerVR SGX544 |
| RAM | 1 GB | 1 GB | 1 GB |
| Internal Memory | 4 GB storage | 16 GB | 4 GB |
| External Memory | microSD, up to 32 GB | No | microSD, up to 32 GB |
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| Type | IPS LCD capacitive touchscreen | IPS LCD capacitive touchscreen | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.0 inches | 4.7 inches | 4.7 inches |
| Resolution | 720 x 1280 pixels (294 ppi) | 720 x 1280 pixels (312 ppi) | 720 x 1280 pixels (312 ppi) |
| Screen-to-Body Ratio | 63.69% | 65.81% | 62.82% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | Stereo FM radio with RDS | FM radio; built-in antenna |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264 x 2448 pixels | 8 MP, 3264x2448 pixels | 12 MP, 4000 x 3000 pixels |
| Flash | LED flash | LED flash | LED flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face Detection | Auto focus, Geo-tagging, Touch Focus, Face Detection, Panorama, HDR | Auto focus, Geo-tagging, Touch Focus, Face Detection |
| Video | Yes, 1080p | Yes, 1080p | Yes |
| Front Camera | Yes, 1.3 MP, 720p [Similar] | Yes, 1.9 MP [Similar] | Yes, 2 MP [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 21 Mbps; HSUPA, 11 Mbps | HSPA+ | HSDPA, HSUPA |
| Bluetooth | Yes, v4.0 with A2DP, EDR | Yes, v3.0 | Yes, v3.0 with A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n, dual band |
| USB | Yes, microUSB v2.0, USB On-the-go | Yes, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML5 | HTML5 | HTML |
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| Internal | 4 GB storage, 1 GB RAM | 16 GB, 1 GB RAM | 4 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 32 GB | No | 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-Ion Battery | Li-Ion Battery | Li-Po Battery |
| Capacity | 2500 mAh | 2000 mAh | 2000 mAh |
| Stand by | - | - | Up to 140 h (2G) Up to 140 h (3G) |
| Talk Time | - | - | Up to 22 h (2G) Up to 10 h (3G) |
