Phone Comparison - Lenovo S820 vs Lenovo Vibe X vs Asus Zenfone 6
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| Manufacturer | Lenovo | Lenovo | Asus |
| Announced | May 2013 | September 2013 | January 2014 |
| Status | Available - May 2013 | Available - December 2013 | Available - June 2014 |
| Colors | Flamingo red | Black/Silver | Black, White, Red, Gold |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
139.5 x 69.7 x 9 mm (5.49 x 2.74 x 0.35 in) |
6.9 mm thickness (0.27 in thickness) |
166.9 x 84.3 x 5.5-9.9 mm (6.57 x 3.32 x 0.22-0.39 in) |
| Weight | 143 g (5.04 oz) | 120 g (4.23 oz) | 196 g (6.91 oz) |
| 2G Network | GSM 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 900 / 2100 | HSDPA | HSDPA 850 / 900 / 1900 / 2100 |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Android OS, v4.2 (Jelly Bean) | Android OS, v4.2 (Jelly Bean) | Android OS, v4.3 (Jelly Bean), upgradable to v4.4.2 (KitKat) |
| Processor | Quad-core 1.2 GHz, MTK 6589W | Quad-core 1.5 GHz, MTK MT6589T | Dual-core 2 GHz, Intel Atom Z2580 |
| GPU | PowerVR SGX544 | PowerVR SGX544 | PowerVR SGX544MP2 |
| RAM | 1 GB | 2 GB | 1/2 GB |
| Internal Memory | 4 GB | 16 GB | 8/16/32 GB |
| External Memory | microSD, up to 32 GB | No | microSD, up to 64 GB |
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| Type | IPS LCD capacitive touchscreen | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 3 |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.7 inches | 5.0 inches | 6.0 inches |
| Resolution | 720 x 1280 pixels (312 ppi) | 1080 x 1920 pixels (441 ppi) | 720 x 1280 pixels (245 ppi) |
| Screen-to-Body Ratio | 62.82% | - | 70.40% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio; built-in antenna | - | No |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 12 MP, 4000 x 3000 pixels | 13 MP, 4128 x 3096 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | LED flash | LED flash | LED flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face Detection | Auto focus, Geo-tagging, Touch Focus, Face Detection | Auto focus, Geo-tagging, Touch Focus, Face Detection |
| Video | Yes | Yes, 1080p@30fps | Yes |
| Front Camera | Yes, 2 MP [Similar] | Yes, 5 MP [Similar] | Yes, 2 MP [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, HSUPA | HSPA+ | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps |
| Bluetooth | Yes, v3.0 with A2DP | Yes, v4.0 with A2DP | Yes, v4.0 with A2DP, EDR |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, dual band | Wi-Fi 802.11 a/b/g/n, dual band, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0, USB On-the-go | Yes, microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML | HTML5 | HTML |
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| Internal | 4 GB, 1 GB RAM | 16 GB, 2 GB RAM | 8/16/32 GB, 1/2 GB RAM |
| Expandable Storage | microSD, up to 32 GB | No | microSD, up to 64 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-Po Battery | Li-Ion Battery | Non-removable Li-Po Battery |
| Capacity | 2000 mAh | 2000 mAh | 3300 mAh |
| Stand by | Up to 140 h (2G) Up to 140 h (3G) |
- | Up to 398 h (3G) |
| Talk Time | Up to 22 h (2G) Up to 10 h (3G) |
- | Up to 28 h (3G) |
