Phone Comparison - Apple iPhone 4 vs Asus Zenfone 4 vs OPPO Neo R831K
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| Manufacturer | Apple | Asus | Oppo |
| Announced | June 2010 | January 2014 | August 2014 |
| Status | Available - June 2010 | Available - June 2014 | Available - August 2014 |
| Colors | Black, White | Black, White, Red, Blue, Yellow | White, Black |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
115.2 x 58.6 x 9.3 mm (4.54 x 2.31 x 0.37 in) |
124.4 x 61.4 x 6.3-11.2 (4.9 x 2.42 x 0.25-0.44) |
132 x 65.8 x 9.2 mm (5.2 x 2.59 x 0.36 in) |
| Weight | 137 g (4.83 oz) | 115 g (4.06 oz) | 130 g (4.59 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 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 2100 |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail |
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| OS | iOS 4, upgradable to iOS 5 | Android OS, v4.3 (Jelly Bean), upgradable to v4.4.2 (KitKat) | Android OS, v4.2.2 (Jelly Bean) based Color OS |
| Processor | 1 GHz Cortex-A8, Apple A4 | Dual-core 1.2 GHz, Intel Atom Z2520 | Dual-core 1.3 GHz |
| GPU | PowerVR SGX535 | PowerVR SGX544MP2 | - |
| RAM | 512 MB | 1 GB | 1 GB |
| Internal Memory | 8/16/32 GB storage | 8 GB | 4 GB |
| External Memory | No | microSD, up to 64 GB | microSD, up to 32 GB |
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| Type | LED-backlit IPS TFT, capacitive touchscreen | LCD Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 3.5 inches | 4.0 inches | 4.5 inches |
| Resolution | 640 x 960 pixels (330 ppi) | 480 x 800 pixels (233 ppi) | 480 x 854 pixels (218 ppi) |
| Screen-to-Body Ratio | 53.92% | 59.74% | 64.07% |
| 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, 2592 x 1944 pixels | 5 MP, 2592 x 1944 pixels | 5 MP, 2592 x 1944 pixels |
| Flash | LED flash | No | LED Flash |
| Features | Auto focus, Touch Focus, Geo-tagging, HDR | Auto focus, Geo-tagging, Panorama | Auto focus, Geo-tagging, Touch Focus, Face Detection, HDR |
| Video | Yes, 720p@30fps, LED video light, geo-tagging | Yes, 1080p@30fps | Yes |
| Front Camera | Yes, videocalling over Wi-Fi only [Similar] | Yes, VGA [Similar] | Yes, 2 MP [Similar] |
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| GPRS | Class 10 (4+1/3+2 slots), 32 - 48 kbps | Yes | Yes |
| Edge | Class 10, 236.8 kbps | Yes | Yes |
| 3G | HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps | HSPA+ |
| Bluetooth | Yes, v2.1 with A2DP | Yes, v4.0 with A2DP, EDR | v2.1, A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot |
| USB | Yes, v2.0 | Yes, microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support | Yes, with A-GPS |
| Browser | HTML (Safari) | HTML | HTML |
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| Internal | 8/16/32 GB storage, 512 MB RAM | 8 GB, 1 GB RAM | 4 GB, 1 GB RAM |
| Expandable Storage | No | 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 | Standard battery, Li-Po | Li-Po Battery | Li-Ion Battery |
| Capacity | 1420 mAh | 1200/1600 mAh | 1900 mAh |
| Stand by | Up to 300 h (2G) Up to 300 h (3G) |
Up to 192 h | - |
| Talk Time | Up to 14 h (2G) Up to 7 h (3G) |
Up to 10 h | - |
