Phone Comparison - Nokia Lumia 520 vs Nokia X vs Nokia Lumia 638
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| Manufacturer | Nokia | Nokia | Nokia |
| Announced | February 2013 | February 2014 | December 2014 |
| Status | Available - April 2013 | Available - February 2014 | Available - December 2014 |
| Price | - | - | Rs. 7,999 ($117.63) [Similarly Priced] |
| Colors | Yellow, red, cyan, white/black | White, Black, Red, Yellow, Green, Cyan | Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
119.9 x 64 x 9.9 mm (4.72 x 2.52 x 0.39 in) |
115.5 x 63 x 10.4 mm (4.55 x 2.48 x 0.41 in) |
129.5 x 66.7 x 9.2 mm (5.1 x 2.63 x 0.36 in) |
| Weight | 124 g (4.37 oz) | 128.7 g (4.52.0.25 oz) | 136 g (4.8 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 900 / 2100 HSDPA 850 / 1900 / 2100 |
HSDPA 900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | - | - | LTE 1800 / 1900 / 2100 / 2300 / 2500 / 2600 (Bands 3, 7, 38, 39, 40, 41) |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Microsoft Windows Phone 8 | Nokia X Software Platform 1.0 Based on Android v4.1.2 (JellyBean) | Microsoft Windows Phone 8.1 |
| Processor | Dual-core 1 GHz, Qualcomm MSM8227 Snapdragon S4 | Dual-core 1 GHz, Qualcomm MSM8225 Snapdragon | Quad-core 1.2 GHz Cortex-A7, Qualcomm Snapdragon 400 |
| GPU | Adreno 305 | Adreno 203 | Adreno 305 |
| RAM | 512 MB | 512 MB | 1 GB |
| Internal Memory | 8 GB storage | 4 GB ROM | 8 GB |
| External Memory | microSD, up to 64 GB | microSD, up to 32 GB | microSD, up to 128 GB |
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| Type | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen | IPS LCD capacitive touchscreen, Corning Gorilla Glass 3, ClearBlack Display |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.0 inches | 4.0 inches | 4.5 inches |
| Resolution | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (233 ppi) | 480 x 854 pixels (218 ppi) |
| Screen-to-Body Ratio | 59.47% | 62.71% | 64.43% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM Radio | Stereo FM Radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 5 MP, 2592х1944 pixels | 3 MP, 2048x1536 pixels | 5 MP, 2592 х 1944 pixels |
| Flash | No | No | No |
| Features | Auto focus, Geo-tagging | Fixed focus, Geo-tagging, Face And Smile Detection, Panorama | Auto focus, 1/4 |
| Video | Yes, 720p@30fps | Yes | Yes |
| Front Camera | No [Similar] | No [Similar] | No [Similar] |
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| GPRS | Yes | Up to 85.6 kbps | Yes |
| Edge | Yes | Up to 236.8 kbps | Yes |
| 3G | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps | HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | Yes, v3.0 with A2DP, HS | v4.0, A2DP, LE/ apt-X after WP8 Denim update |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, DLNA, hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support and GLONASS | Yes, with A-GPS support | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 8 GB storage, 512 MB RAM | 4 GB ROM, 512 MB RAM | 8 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 64 GB | microSD, up to 32 GB | microSD, up to 128 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 (BL-5H) |
| Capacity | 1430 mAh | 1500 mAh | 1830 mAh |
| Stand by | Up to 384 h (3G) Up to 360 h (3G) |
Up to 408 h | - |
| Talk Time | Up to 17 h 24 min (2G) Up to 9 h 42 min (3G) |
Up to 13 h 18 min (2G) Up to 10 h 30 min (3G) |
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