Phone Comparison - Nokia Lumia 520 vs Asus Zenfone 4 vs Nokia X2
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| Manufacturer | Nokia | Asus | Nokia |
| Announced | February 2013 | January 2014 | June 2014 |
| Status | Available - April 2013 | Available - June 2014 | Available - June 2014 |
| Colors | Yellow, red, cyan, white/black | Black, White, Red, Blue, Yellow | Bright green, bright red, cyan, yellow, black, white |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
119.9 x 64 x 9.9 mm (4.72 x 2.52 x 0.39 in) |
124.4 x 61.4 x 6.3-11.2 (4.9 x 2.42 x 0.25-0.44) |
121.7 x 68.3 x 11.1 mm (4.79 x 2.69 x 0.44 in) |
| Weight | 124 g (4.37 oz) | 115 g (4.06 oz) | 150 g (5.29 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 900 / 2100 HSDPA 850 / 1900 / 2100 |
HSDPA 850 / 900 / 1900 / 2100 | HSDPA 900 / 2100 |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
| Build Features | - | - | - Scratch-resistant glass - ClearBlack display |
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| OS | Microsoft Windows Phone 8 | Android OS, v4.3 (Jelly Bean), upgradable to v4.4.2 (KitKat) | Nokia X Software Platform 2.0 Based on Android OS, v4.3 (Jelly Bean) |
| Processor | Dual-core 1 GHz, Qualcomm MSM8227 Snapdragon S4 | Dual-core 1.2 GHz, Intel Atom Z2520 | Dual-core 1.2 GHz Cortex-A7, Qualcomm MSM8210 Snapdragon 200 |
| GPU | Adreno 305 | PowerVR SGX544MP2 | Adreno 302 |
| RAM | 512 MB | 1 GB | 1 GB |
| Internal Memory | 8 GB storage | 8 GB | 4 GB |
| External Memory | microSD, up to 64 GB | microSD, up to 64 GB | microSD, up to 32 GB |
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| Type | IPS LCD capacitive touchscreen | LCD Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.0 inches | 4.0 inches | 4.3 inches |
| Resolution | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (217 ppi) |
| Screen-to-Body Ratio | 59.47% | 59.74% | 63.29% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM Radio | 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, 2592 x 1944 pixels | 5 MP, 2592 х 1944 pixels |
| Flash | No | No | LED Flash |
| Features | Auto focus, Geo-tagging | Auto focus, Geo-tagging, Panorama | 1/4'' Sensor Size, Geo-tagging, Touch Focus, Panorama, Face Detection |
| Video | Yes, 720p@30fps | Yes, 1080p@30fps | Yes, 720p@30fps |
| Front Camera | No [Similar] | Yes, VGA [Similar] | Yes, VGA, 480p [Similar] |
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| GPRS | Yes | Yes | Up to 85.6 kbps |
| Edge | Yes | Yes | Up to 236.8 kbps |
| 3G | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps | HSDPA, 21 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | Yes, v4.0 with A2DP, EDR | Yes, v4.0 with A2DP, HS |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | Yes, with A-GPS support and GLONASS | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML5 | HTML | HTML |
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| Internal | 8 GB storage, 512 MB RAM | 8 GB, 1 GB RAM | 4 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 64 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-Po Battery | Li-Ion Battery |
| Capacity | 1430 mAh | 1200/1600 mAh | 1800 mAh |
| Stand by | Up to 384 h (3G) Up to 360 h (3G) |
Up to 192 h | Up to 552 h |
| Talk Time | Up to 17 h 24 min (2G) Up to 9 h 42 min (3G) |
Up to 10 h | Up to 10 h (2G) Up to 13 h (3G) |
