Phone Comparison - Karbonn A15 vs Karbonn A21 vs Xolo A500S
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| Manufacturer | Karbonn | Karbonn | Xolo |
| Announced | 2012 | 2012 | August 2013 |
| Status | Available | Available | Available - August 2013 |
| Colors | Black | Pearl White | Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension | - | - |
125 x 63.2 x 8.98 mm (4.92 x 2.49 x 0.35 in) |
| Weight | - | - | - |
| 2G Network | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 2100 | HSDPA 2100 | HSDPA 2100 |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Android OS, v4.0.4 (Ice Cream Sandwich) | Android OS, v4.0 (Ice Cream Sandwich) | Android OS, v4.2 (Jelly Bean) |
| Processor | 1 GHz | Dual-core 1.2 GHz | Dual-core 1.2 GHz, MediaTek MT6572W |
| GPU | - | - | Mali-400MP |
| RAM | 512 MB | 512 MB | 512 MB |
| Internal Memory | 4 GB (2.5 GB user available) | 4 GB | 4 GB |
| External Memory | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 32 GB |
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| Type | TFT touchscreen | TFT capacitive touchscreen | TFT capacitive touchscreen |
| Colors | TFT touchscreen | 256K colors | 16M colors |
| Size | 4.0 inches | 4.5 inches | 4.0 inches |
| Resolution | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (207 ppi) | 480 x 800 pixels (233 ppi) |
| Screen-to-Body Ratio | - | - | 57.76% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | No | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 3.15 MP, 2048x1536 pixels | 5 MP, 2592х1944 pixels | 5 MP, 2592х1944 pixels |
| Flash | No | LED flash | LED flash |
| Features | Geo-tagging, Face Detection | Auto focus, Geo-tagging, Face Detection | Auto focus, Geo-tagging, Touch Focus, Face And Smile Detection |
| Video | Yes | Yes | Yes, 720p |
| Front Camera | Yes [Similar] | Yes, 1.3 MP [Similar] | Yes, VGA [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 7.2 Mbps | HSDPA, 7.2 Mbps | HSDPA, 21.1 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, with A2DP | Yes, v2.1 with A2DP | Yes, v3.0 |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | Yes |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML | HTML | HTML5 |
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| Internal | 4 GB (2.5 GB user available), 512 MB RAM | 4 GB, 512 MB RAM | 4 GB, 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 | 1420 mAh | 1800 mAh | 1400 mAh |
| Stand by | Up to 150 h | Up to 200 h | Up to 492 h (2G) Up to 470 h (3G) |
| Talk Time | - | Up to 5 h | Up to 10 h (2G) Up to 8 h (3G) |
