Phone Comparison - Karbonn A21 vs Karbonn A2 vs Karbonn Smart A2+
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| Manufacturer | Karbonn | Karbonn | Karbonn |
| Announced | 2012 | March 2013 | April 2013 |
| Status | Available | Available - March 2013 | Available - April 2013 |
| Colors | Pearl White | White/Black | White/Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension | - |
124 x 63.6 x 12.4 mm (4.88 x 2.5 x 0.49 in) |
123.7 x 63.6 x 12.4 mm (4.87 x 2.5 x 0.49 in) |
| Weight | - | 110 g (3.88 oz) | - |
| 2G Network | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 2100 | N/A | N/A |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM |
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| OS | Android OS, v4.0 (Ice Cream Sandwich) | Android OS, v2.3.6 (Gingerbread) | Android OS, v4.0 (Ice Cream Sandwich) |
| Processor | Dual-core 1.2 GHz | 1 GHz | 1 GHz |
| GPU | - | - | - |
| RAM | 512 MB | N/A | 256 MB |
| Internal Memory | 4 GB | 202 MB | 202 MB |
| 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 | Capacitive touchscreen | Capacitive touchscreen |
| Colors | 256K colors | - | - |
| Size | 4.5 inches | 4.0 inches | 4.0 inches |
| Resolution | 480 x 800 pixels (207 ppi) | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (233 ppi) |
| Screen-to-Body Ratio | - | 57.86% | 58.00% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 5 MP, 2592х1944 pixels | 3.0 MP, 2048x1536 pixels | 3.0 MP, 2048x1536 pixels |
| Flash | LED flash | No | No |
| Features | Auto focus, Geo-tagging, Face Detection | - | - |
| Video | Yes | Yes | Yes |
| Front Camera | Yes, 1.3 MP [Similar] | Yes [Similar] | Yes [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 7.2 Mbps | N/A | N/A |
| Bluetooth | Yes, v2.1 with A2DP | Yes | Yes |
| Wi-Fi | Wi-Fi 802.11 b/g/n | No | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes | Yes |
| GPS | Yes, with A-GPS support | No | No |
| Browser | HTML | HTML | HTML |
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| Internal | 4 GB, 512 MB RAM | 202 MB | 202 MB, 256 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 | 1800 mAh | 1750 mAh | 1750 mAh |
| Stand by | Up to 200 h | Up to 120 h | Up to 120 h |
| Talk Time | Up to 5 h | Up to 3 h 30 min | Up to 3 h 30 min |
