Phone Comparison - Panasonic T31 vs Lava Iris 402+ vs Asus Zenfone 4
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| Manufacturer | Panasonic | Lava | Asus |
| Announced | October 2013 | December 2013 | January 2014 |
| Status | Available - November 2013 | Available - December 2013 | Available - June 2014 |
| Colors | Bluish Black, Pure White | Metallic Brown, Metallic Grey, Metallic White | Black, White, Red, Blue, Yellow |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
122 x 64.4 x 11.95 mm (4.8 x 2.54 x 0.47 in) |
125.5 x 64.5 x 11.4 mm (4.94 x 2.54 x 0.45 in) |
124.4 x 61.4 x 6.3-11.2 (4.9 x 2.42 x 0.25-0.44) |
| Weight | 120 g (4.23 oz) | 124 g (4.37 oz) | 115 g (4.06 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 850 / 1900 / 2100 | HSDPA 2100 | HSDPA 850 / 900 / 1900 / 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, v4.2.2 (Jelly Bean) with FOTA upgrade | Android OS, v4.2(Jelly Bean) | Android OS, v4.3 (Jelly Bean), upgradable to v4.4.2 (KitKat) |
| Processor | Dual-core 1.3 GHz, MTK 6572 | Dual-core 1.2 GHz, MediaTek MT6572 | Dual-core 1.2 GHz, Intel Atom Z2520 |
| GPU | Mali-400 | Mali-400MP | PowerVR SGX544MP2 |
| RAM | 512 MB | 512 GB | 1 GB |
| Internal Memory | 4 GB (1.9 GB user memory) | 4 GB (App Memory - 1.25 GB, User Memory - 1.25 GB) | 8 GB |
| External Memory | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 64 GB |
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| Type | TFT capacitive touchscreen | TFT touchscreen | LCD Capacitive Touchscreen, Corning Gorilla Glass 3 |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.0 inches | 4.0 inches | 4.0 inches |
| Resolution | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (233 ppi) |
| Screen-to-Body Ratio | 58.08% | 56.37% | 59.74% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM Radio with Recording | FM radio with RDS, FM Recording | FM Radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 3.2 MP, 2048x1536 pixels | 3.0 MP, 2048x1536 pixels | 5 MP, 2592 x 1944 pixels |
| Flash | No | Yes | No |
| Features | Fixed Focus, Geo-tagging | Auto Focus, Face Detection, Panaroma Mode (Horizontal and Vertical), Burst Mode (40 & 99 Shots) | Auto focus, Geo-tagging, Panorama |
| Video | Yes, VGA@30fps | Yes, 720p@30fps | Yes, 1080p@30fps |
| Front Camera | Yes, VGA [Similar] | Yes, VGA [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, HSUPA | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | Yes, with A2DP | Yes, v4.0 with A2DP, EDR |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes | 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 (1.9 GB user memory), 512 MB RAM | 4 GB (App Memory - 1.25 GB, User Memory - 1.25 GB), 512 GB RAM | 8 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 64 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 | Li-Ion Battery | Li-Ion Battery | Li-Po Battery |
| Capacity | 1300 mAh | 1500 mAh | 1200/1600 mAh |
| Stand by | Up to 510 h (2G) Up to 400 h (3G) |
Up to 200 h | Up to 192 h |
| Talk Time | Up to 3 h 30 min (2G) Up to 9 h 30 min (3G) |
Up to 4 h (2G) Up to 2 h 30 min (3G) |
Up to 10 h |
