Phone Comparison - Karbonn A21 vs Nokia Lumia 520 vs Spice Mi-502 Smartflo Pace2
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| Manufacturer | Karbonn | Nokia | Spice |
| Announced | 2012 | February 2013 | May 2013 |
| Status | Available | Available - April 2013 | Available - May 2013 |
| Colors | Pearl White | Yellow, red, cyan, white/black | White, Blue |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension | - |
119.9 x 64 x 9.9 mm (4.72 x 2.52 x 0.39 in) |
148 x 77.2 x 9.6 mm (5.83 x 3.04 x 0.38 in) |
| Weight | - | 124 g (4.37 oz) | 185 g (6.53 oz) |
| 2G Network | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 | GSM 900 / 1800 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 2100 | HSDPA 900 / 2100 HSDPA 850 / 1900 / 2100 |
N/A |
| 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, v4.0 (Ice Cream Sandwich) |
| Processor | Dual-core 1.2 GHz | Dual-core 1 GHz, Qualcomm MSM8227 Snapdragon S4 | - |
| GPU | - | Adreno 305 | - |
| RAM | 512 MB | 512 MB | N/A |
| Internal Memory | 4 GB | 8 GB storage | 512 MB |
| 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 | Capacitive touchscreen |
| Colors | 256K colors | 16M colors | - |
| Size | 4.5 inches | 4.0 inches | 5.0 inches |
| Resolution | 480 x 800 pixels (207 ppi) | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (187 ppi) |
| Screen-to-Body Ratio | - | 59.47% | 62.01% |
| 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 | 5 MP, 2592х1944 pixels | 5 MP, 2592x1944 pixels |
| Flash | LED flash | No | dual-LED flash |
| Features | Auto focus, Geo-tagging, Face Detection | Auto focus, Geo-tagging | Auto focus, Geo-tagging, Touch Focus |
| Video | Yes | Yes, 720p@30fps | Yes |
| Front Camera | Yes, 1.3 MP [Similar] | No [Similar] | Yes, 1.3 MP [Similar] |
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| GPRS | Yes | Yes | Class 12 (4+1/3+2/2+3/1+4 slots), 32 - 48 kbps |
| Edge | Yes | Yes | Class 12 |
| 3G | HSDPA, 7.2 Mbps | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps | N/A |
| Bluetooth | Yes, v2.1 with A2DP | Yes, v4.0 with A2DP | Yes, v4.0 |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n | Yes |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | Yes, microUSB v2.0, USB On-the-go |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support and GLONASS | A-GPS support only |
| Browser | HTML | HTML5 | HTML |
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| Internal | 4 GB, 512 MB RAM | 8 GB storage, 512 MB RAM | 512 MB |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 64 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 | Li-Ion Battery | Li-Ion Battery | Li-Ion Battery |
| Capacity | 1800 mAh | 1430 mAh | 2100 mAh |
| Stand by | Up to 200 h | Up to 384 h (3G) Up to 360 h (3G) |
Up to 288 h |
| Talk Time | Up to 5 h | Up to 17 h 24 min (2G) Up to 9 h 42 min (3G) |
Up to 4 h 20 min |
