Phone Comparison - Lenovo K900 vs Karbonn A21 vs Karbonn A12
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| Manufacturer | Lenovo | Karbonn | Karbonn |
| Announced | January 2013 | 2012 | February 2013 |
| Status | Available - April 2013 | Available | Available - February 2013 |
| Colors | Black | Pearl White | Black/White |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
157 x 78 x 6.9 mm (6.18 x 3.07 x 0.27 in) |
- |
135 x 66 x 11 mm (5.31 x 2.6 x 0.43 in) |
| Weight | 162 g (5.71 oz) | - | 164 g (5.78 oz) |
| 2G Network | GSM 850 / 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 | HSDPA 2100 | HSDPA 2100 - SIM 1 only |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Android OS, v4.2 (Jelly Bean) | Android OS, v4.0 (Ice Cream Sandwich) | Android OS, v4.0.4 (Ice Cream Sandwich) |
| Processor | Dual-core 2.0 GHz, Intel Atom Z2580 | Dual-core 1.2 GHz | 1 GHz |
| GPU | PowerVR SGX544 | - | - |
| RAM | 2 GB | 512 MB | 512 MB |
| Internal Memory | 16 GB | 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 | IPS LCD capacitive touchscreen | TFT capacitive touchscreen | Capacitive Touchscreen |
| Colors | 16M colors | 256K colors | 262K colors |
| Size | 5.5 inches | 4.5 inches | 4.5 inches |
| Resolution | 1080 x 1920 pixels (401 ppi) | 480 x 800 pixels (207 ppi) | 480 x 854 pixels (218 ppi) |
| Screen-to-Body Ratio | 67.94% | - | 62.46% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | Stereo FM radio | No | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 13 MP, autofocus | 5 MP, 2592х1944 pixels | 5 MP, 2592х1944 pixels |
| Flash | dual-LED flash | LED flash | LED flash |
| Features | Geo-tagging, Touch Focus, Face Detection | Auto focus, Geo-tagging, Face Detection | Auto focus, Geo-tagging, Face Detection |
| Video | Yes, 1080p@30fps | Yes | Yes |
| Front Camera | Yes, 2 MP [Similar] | Yes, 1.3 MP [Similar] | Yes, VGA [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSPA+ | HSDPA, 7.2 Mbps | HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, with A2DP | Yes, v2.1 with A2DP | Yes |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, dual band, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML5 | HTML | HTML |
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| Internal | 16 GB, 2 GB 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 | 2500 mAh | 1800 mAh | 1800 mAh |
| Stand by | - | Up to 200 h | Up to 180 h |
| Talk Time | - | Up to 5 h | Up to 4 h |
