Phone Comparison - Karbonn Smart A51 vs Samsung Galaxy Trend Duos S7392 vs Panasonic T31
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| Manufacturer | Karbonn | Samsung | Panasonic |
| Announced | September 2013 | September 2013 | October 2013 |
| Status | Available - September 2013 | Available - September 2013 | Available - November 2013 |
| Colors | White Silver | White, Gray | Bluish Black, Pure White |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension | - |
121.5 x 63.1 x 10.85 mm (4.78 x 2.48 x 0.43 in) |
122 x 64.4 x 11.95 mm (4.8 x 2.54 x 0.47 in) |
| Weight | - | 126 g (4.44 oz) | 120 g (4.23 oz) |
| 2G Network | GSM 900 / 1800 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | No | HSDPA 900 / 2100 - SIM 1 | HSDPA 850 / 1900 / 2100 |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM |
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| OS | Android OS, v4.0 (Ice Cream Sandwich) | Android OS, v4.1.2 (Jelly Bean) | Android OS, v4.2.2 (Jelly Bean) with FOTA upgrade |
| Processor | 1 GHz | 1 GHz Cortex-A9 | Dual-core 1.3 GHz, MTK 6572 |
| GPU | - | - | Mali-400 |
| RAM | 256 MB | 512 MB | 512 MB |
| Internal Memory | 512 MB (100 MB user available) | 4 GB (User Memory: 2.05 GB) | 4 GB (1.9 GB user memory) |
| External Memory | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 32 GB |
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| Type | TFT capacitive touchscreen | TFT capacitive touchscreen | TFT capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 3.5 inches | 4.0 inches | 4.0 inches |
| Resolution | 320 x 480 pixels (165 ppi) | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (233 ppi) |
| Screen-to-Body Ratio | - | 59.52% | 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 | 3.15 MP, 2048x1536 pixels | 3.15 MP, 2048x1536 pixels | 3.2 MP, 2048x1536 pixels |
| Flash | LED flash | No | No |
| Features | - | CMOS Sensor, Single Shot, Panorama, Smile Shot, Share Shot, Photo Effects, White Balance, Timer, SF, 360 Deg Rotation | Fixed Focus, Geo-tagging |
| Video | Yes | Yes | Yes, VGA@30fps |
| Front Camera | Yes, VGA [Similar] | No [Similar] | Yes, VGA [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | No | HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes | Yes, v3.0 | Yes, v4.0 with A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g, 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 | Yes, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | No | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML | HTML | HTML5 |
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| Internal | 512 MB (100 MB user available), 256 MB RAM | 4 GB (User Memory: 2.05 GB), 512 MB RAM | 4 GB (1.9 GB user memory), 512 MB RAM |
| Expandable Storage | microSD, up to 32 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 | 1100 mAh | 1500 mAh | 1300 mAh |
| Stand by | - | Up to 350 h (3G) | Up to 510 h (2G) Up to 400 h (3G) |
| Talk Time | - | Up to 8 h (3G) | Up to 3 h 30 min (2G) Up to 9 h 30 min (3G) |
