Phone Comparison - Samsung Galaxy S Duos 2 S7582 vs Karbonn Smart A11 Star vs Karbonn Opium N7
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| Manufacturer | Samsung | Karbonn | Karbonn |
| Announced | November 2013 | June 2014 | July 2014 |
| Status | Available - November 2013 | Available - June 2014 | Available - July 2014 |
| Colors | White, Black | White, Black | Black, White |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
121.5 x 63.1 x 10.57 mm (4.78 x 2.48 x 0.42 in) |
129.9 x 69 x 9.4 mm (5.11 x 2.72 x 0.37 in) |
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| Weight | 118 g (4.16 oz) | 120 g (4.23 oz) | - |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 - SIM 1 & SIM 2 | GSM 900 / 1800 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 900 / 2100 | HSDPA 2100 | HSDPA 2100 |
| Messaging | SMS, MMS, Push Mail, EMail | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Android OS, v4.2 (Jelly Bean) | Android OS, v4.4.2 (KitKat) | Android OS, v4.3 (Jelly Bean) |
| Processor | Dual-core 1.2 GHz Cortex-A9, Broadcom BCM21664 | Dual-core 1.2 GHz, MTK 6572 | Quad-core 1.2 GHz, Qualcomm MSM8212 Snapdragon 200 |
| GPU | Broadcom VideoCore IV | Mali-400MP | Adreno 302 |
| RAM | 768 MB | 512 MB | 512 MB |
| Internal Memory | 4 GB (1.9 GB user available) | 4 GB (2.4 GB internal storage) | 4 GB ROM |
| 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, PLS | IPS LCD Capacitive Touchscreen, Wide Viewing Angle | IPS LCD Capacitive Touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.0 inches | 4.3 inches | 4.0 inches |
| Resolution | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (217 ppi) | 480 x 800 pixels (233 ppi) |
| Screen-to-Body Ratio | 59.52% | 58.70% | - |
| 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 | 5 MP, 2592х1944 pixels | 5 MP, 2592х1944 pixels | 5 MP, 2592х1944 pixels |
| Flash | LED flash | LED flash | LED Flash |
| Features | Auto focus, Geo-tagging | Auto-focus, Geo-tagging, Face Detection, Panorama | Auto focus, Geo-tagging, Panorama |
| Video | Yes, 720p@30fps | Yes, 720p | Yes |
| 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, 21 Mbps; HSUPA, 5.76 Mbps | HSDPA, 21 Mbps; HSUPA, 11 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | Yes, v2.0 A2DP, EDR | Yes, v4.0 |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot, Wi-Fi Direct | 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, USB On-the-go |
| 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 | 4 GB (1.9 GB user available), 768 MB RAM | 4 GB (2.4 GB internal storage), 512 MB RAM | 4 GB ROM, 512 MB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 32 GB |
| USB OTG | - | - | 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 | 1500 mAh | 1400 mAh | 1600 mAh |
| Stand by | Up to 280 h (3G) | Up to 250 h (2G) | - |
| Talk Time | Up to 8 h (3G) | - | - |
