Phone Comparison - Samsung Galaxy Grand Duos I9082 vs Panasonic P51 vs Panasonic P31
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| Manufacturer | Samsung | Panasonic | Panasonic |
| Announced | December 2012 | May 2013 | March 2014 |
| Status | Available - January 2013 | Available - May 2013 | Available - May 2014 |
| Colors | Black, White | Black, White | Pure White, Bluish Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
143.5 x 76.9 x 9.6 mm (5.65 x 3.03 x 0.38 in) |
144 x 75 x 8.5 mm (5.67 x 2.95 x 0.33 in) |
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| Weight | 162 g (5.71 oz) | 135 g (4.76 oz) | - |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 1900 / 2100 - SIM 1 only HSDPA 900 / 1900 / 2100 - SIM 1 only |
HSDPA 900 / 2100 | HSDPA 2100 |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Android OS, v4.1.2 (Jelly Bean) | Android OS, v4.2 (Jelly Bean) | Android OS, v4.2.2 (Jelly Bean) |
| Processor | Dual-core 1.2 GHz Cortex-A9, Broadcom | Quad-core 1.2 GHz Cortex-A7, MTK MT6589 | Quad-core 1.3 GHz, Mediatek MT6582M |
| GPU | Broadcom VideoCore IV | PowerVR SGX544 | Mali-400MP2 |
| RAM | 1 GB | 1 GB | 512 MB |
| Internal Memory | 8 GB | 4 GB storage | 4 GB ROM |
| External Memory | microSD, up to 64 GB | microSD, up to 32 GB | microSD, up to 32 GB |
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| Type | Capacitive touchscreen | IPS LCD capacitive touchscreen | TFT Capacitive Touchscreen, Ultra Oleophobic Coating |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.0 inches | 5.0 inches | 5 inches |
| Resolution | 480 x 800 pixels (187 ppi) | 720 x 1280 pixels (294 ppi) | 480 x 854 pixels (196 ppi) |
| Screen-to-Body Ratio | 64.20% | 63.69% | - |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | Stereo FM radio with RDS | FM radio | FM Radio with Recording |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264x2448 pixels | 8 MP, 3264 x 2448 pixels | 8 MP, 3264x2448 pixels |
| Flash | LED flash | LED flash | LED flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face And Smile Detection, Image Stabilization | Auto focus, Geo-tagging, Touch Focus, Face Detection | Auto focus, Geo-tagging, Touch Focus, Face Detection, HDR |
| Video | Yes, 1080p@30fps | Yes, 1080p | Yes, 1080p@30fps |
| Front Camera | Yes, 2 MP [Similar] | Yes, 1.3 MP, 720p [Similar] | Yes, VGA [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps | HSDPA, 21 Mbps; HSUPA, 11 Mbps | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, v4.0 with A2DP, LE, EDR | Yes, v4.0 with A2DP, EDR | Yes, v4.0 with A2DP |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0, USB On-the-go | Yes, microUSB v2.0, USB On-the-go |
| GPS | Yes, with A-GPS, support and GLONASS | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 8 GB, 1 GB RAM | 4 GB storage, 1 GB RAM | 4 GB ROM, 512 MB RAM |
| Expandable Storage | microSD, up to 64 GB | microSD, up to 32 GB | microSD, up to 32 GB |
| USB OTG | - | Supported | 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 | Standard battery, Li-Ion | Li-Ion Battery | Li-Ion Battery |
| Capacity | 2100 mAh | 2500 mAh | 2000 mAh |
| Stand by | Up to 440 h | - | Up to 699 h |
| Talk Time | Up to 10 h 10 min | - | Up to 9 h |
