Phone Comparison - Nokia Lumia 520 vs Karbonn A12+ vs Panasonic T31
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| Manufacturer | Nokia | Karbonn | Panasonic |
| Announced | February 2013 | October 2013 | October 2013 |
| Status | Available - April 2013 | Available - October 2013 | Available - November 2013 |
| Colors | Yellow, red, cyan, white/black | White, Black | Bluish Black, Pure White |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
119.9 x 64 x 9.9 mm (4.72 x 2.52 x 0.39 in) |
- |
122 x 64.4 x 11.95 mm (4.8 x 2.54 x 0.47 in) |
| Weight | 124 g (4.37 oz) | - | 120 g (4.23 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 900 / 1800 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 900 / 2100 HSDPA 850 / 1900 / 2100 |
HSDPA 2100 | HSDPA 850 / 1900 / 2100 |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM |
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| OS | Microsoft Windows Phone 8 | Android OS, v4.2.2 (Jelly Bean) | Android OS, v4.2.2 (Jelly Bean) with FOTA upgrade |
| Processor | Dual-core 1 GHz, Qualcomm MSM8227 Snapdragon S4 | Dual-core 1.3 GHz, MTK 6572 | Dual-core 1.3 GHz, MTK 6572 |
| GPU | Adreno 305 | Mali-400MP | Mali-400 |
| RAM | 512 MB | 512 MB | 512 MB |
| Internal Memory | 8 GB storage | 4 GB (1.27 GB for apps, 1.24 GB user available) | 4 GB (1.9 GB user memory) |
| External Memory | microSD, up to 64 GB | microSD, up to 32 GB | microSD, up to 32 GB |
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| Type | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen, Wide Viewing Angle | TFT capacitive touchscreen |
| 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 | 59.47% | - | 58.08% |
| 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 | 5 MP, 2592х1944 pixels | 5 MP, 2592х1944 pixels | 3.2 MP, 2048x1536 pixels |
| Flash | No | LED flash | No |
| Features | Auto focus, Geo-tagging | Auto-focus, Geo-tagging, Face Detection, Panorama | Fixed Focus, Geo-tagging |
| Video | Yes, 720p@30fps | Yes, 720p | Yes, VGA@30fps |
| Front Camera | No [Similar] | Yes, 2 MP [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, 5.76 Mbps | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | Yes, v2.0 A2DP, EDR | Yes, v4.0 with A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n | 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, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | Yes, with A-GPS support and GLONASS | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML5 | HTML | HTML5 |
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| Internal | 8 GB storage, 512 MB RAM | 4 GB (1.27 GB for apps, 1.24 GB user available), 512 MB RAM | 4 GB (1.9 GB user memory), 512 MB RAM |
| Expandable Storage | microSD, up to 64 GB | microSD, up to 32 GB | microSD, up to 32 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-Ion Battery |
| Capacity | 1430 mAh | 1400 mAh | 1300 mAh |
| Stand by | Up to 384 h (3G) Up to 360 h (3G) |
- | Up to 510 h (2G) Up to 400 h (3G) |
| Talk Time | Up to 17 h 24 min (2G) Up to 9 h 42 min (3G) |
- | Up to 3 h 30 min (2G) Up to 9 h 30 min (3G) |
