Phone Comparison - Panasonic P51 vs Asus Zenfone 4 vs Panasonic P31
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| Manufacturer | Panasonic | Asus | Panasonic |
| Announced | May 2013 | January 2014 | March 2014 |
| Status | Available - May 2013 | Available - June 2014 | Available - May 2014 |
| Colors | Black, White | Black, White, Red, Blue, Yellow | Pure White, Bluish Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
144 x 75 x 8.5 mm (5.67 x 2.95 x 0.33 in) |
124.4 x 61.4 x 6.3-11.2 (4.9 x 2.42 x 0.25-0.44) |
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| Weight | 135 g (4.76 oz) | 115 g (4.06 oz) | - |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 2100 |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Android OS, v4.2 (Jelly Bean) | Android OS, v4.3 (Jelly Bean), upgradable to v4.4.2 (KitKat) | Android OS, v4.2.2 (Jelly Bean) |
| Processor | Quad-core 1.2 GHz Cortex-A7, MTK MT6589 | Dual-core 1.2 GHz, Intel Atom Z2520 | Quad-core 1.3 GHz, Mediatek MT6582M |
| GPU | PowerVR SGX544 | PowerVR SGX544MP2 | Mali-400MP2 |
| RAM | 1 GB | 1 GB | 512 MB |
| Internal Memory | 4 GB storage | 8 GB | 4 GB ROM |
| External Memory | microSD, up to 32 GB | microSD, up to 64 GB | microSD, up to 32 GB |
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| Type | IPS LCD capacitive touchscreen | LCD Capacitive Touchscreen, Corning Gorilla Glass 3 | TFT Capacitive Touchscreen, Ultra Oleophobic Coating |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.0 inches | 4.0 inches | 5 inches |
| Resolution | 720 x 1280 pixels (294 ppi) | 480 x 800 pixels (233 ppi) | 480 x 854 pixels (196 ppi) |
| Screen-to-Body Ratio | 63.69% | 59.74% | - |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | FM Radio | FM Radio with Recording |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264 x 2448 pixels | 5 MP, 2592 x 1944 pixels | 8 MP, 3264x2448 pixels |
| Flash | LED flash | No | LED flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face Detection | Auto focus, Geo-tagging, Panorama | Auto focus, Geo-tagging, Touch Focus, Face Detection, HDR |
| Video | Yes, 1080p | Yes, 1080p@30fps | Yes, 1080p@30fps |
| Front Camera | Yes, 1.3 MP, 720p [Similar] | Yes, VGA [Similar] | Yes, VGA [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 21 Mbps; HSUPA, 11 Mbps | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, v4.0 with A2DP, EDR | Yes, v4.0 with A2DP, EDR | Yes, v4.0 with A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0, USB On-the-go | Yes, microUSB v2.0 | Yes, microUSB v2.0, USB On-the-go |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML5 | HTML | HTML5 |
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| Internal | 4 GB storage, 1 GB RAM | 8 GB, 1 GB RAM | 4 GB ROM, 512 MB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 64 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 | Li-Ion Battery | Li-Po Battery | Li-Ion Battery |
| Capacity | 2500 mAh | 1200/1600 mAh | 2000 mAh |
| Stand by | - | Up to 192 h | Up to 699 h |
| Talk Time | - | Up to 10 h | Up to 9 h |
