Phone Comparison - Karbonn A21 vs Nokia Lumia 520 vs Sony Xperia M
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| Manufacturer | Karbonn | Nokia | Sony |
| Announced | 2012 | February 2013 | June 2013 |
| Status | Available | Available - April 2013 | Available - August 2013 |
| Colors | Pearl White | Yellow, red, cyan, white/black | Black, White, Purple, Yellow |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension | - |
119.9 x 64 x 9.9 mm (4.72 x 2.52 x 0.39 in) |
124 x 62 x 9.3 mm (4.88 x 2.44 x 0.37 in) |
| Weight | - | 124 g (4.37 oz) | 115 g (4.06 oz) |
| 2G Network | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - Both Versions |
| 3G Network | HSDPA 2100 | HSDPA 900 / 2100 HSDPA 850 / 1900 / 2100 |
HSDPA 900 / 2100 - C1905 HSDPA 850 / 1700 / 1900 / 2100 - C1904 |
| 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 (Ice Cream Sandwich) | Microsoft Windows Phone 8 | Android OS, v4.1 (Jelly Bean) |
| Processor | Dual-core 1.2 GHz | Dual-core 1 GHz, Qualcomm MSM8227 Snapdragon S4 | Dual-core 1 GHz Krait, Qualcomm MSM8227 |
| GPU | - | Adreno 305 | Adreno 305 |
| RAM | 512 MB | 512 MB | 1 GB |
| Internal Memory | 4 GB | 8 GB storage | 4 GB |
| External Memory | microSD, up to 32 GB | microSD, up to 64 GB | microSD, up to 32 GB |
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| Type | TFT capacitive touchscreen | IPS LCD capacitive touchscreen | TFT capacitive touchscreen |
| Colors | 256K colors | 16M colors | 16M 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 854 pixels (245 ppi) |
| Screen-to-Body Ratio | - | 59.47% | 57.31% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | FM Radio | Stereo FM radio with RDS |
| 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 | No | LED flash |
| Features | Auto focus, Geo-tagging, Face Detection | Auto focus, Geo-tagging | Auto focus, Geo-tagging, Touch Focus, Image Stabilization, HDR, Panorama |
| Video | Yes | Yes, 720p@30fps | Yes, 720p@30fps |
| Front Camera | Yes, 1.3 MP [Similar] | No [Similar] | Yes, VGA [Similar] |
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| GPRS | Yes | Yes | Up to 86 kbps |
| Edge | Yes | Yes | Up to 237 kbps |
| 3G | HSDPA, 7.2 Mbps | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, v2.1 with A2DP | Yes, v4.0 with A2DP | Yes, v4.0 with A2DP, ANT+ |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support and GLONASS | Yes, with A-GPS support |
| Browser | HTML | HTML5 | HTML5 |
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| Internal | 4 GB, 512 MB RAM | 8 GB storage, 512 MB RAM | 4 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 64 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 | 1430 mAh | 1700 mAh |
| Stand by | Up to 200 h | Up to 384 h (3G) Up to 360 h (3G) |
Up to 498 h (2G) Up to 454 h (3G) |
| Talk Time | Up to 5 h | Up to 17 h 24 min (2G) Up to 9 h 42 min (3G) |
Up to 10 h 16 min (2G) Up to 9 h (3G) |
