Phone Comparison - Asus Zenfone 4 vs OPPO Neo R831K vs Xiaomi Redmi 2A
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| Manufacturer | Asus | Oppo | Xiaomi |
| Announced | January 2014 | August 2014 | March 2015 |
| Status | Available - June 2014 | Available - August 2014 | Available - March 2015 |
| Price | - | - | Rs. 5,999 ($88.22) [Similarly Priced] |
| Colors | Black, White, Red, Blue, Yellow | White, Black | Black, White, Yellow, Pink, Green |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
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) |
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| Weight | 115 g (4.06 oz) | 130 g (4.59 oz) | - |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 2100 | HSDPA 850 / 1900 / 2100 TD-SCDMA 1900 / 2100 |
| 4G Network | - | - | LTE 1800 / 2600 TD-LTE 1900 / 2300 / 2500 / 2600 (Bands 3, 7, 38, 39, 40, 41) |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail | SMS, MMS, EMail, IM |
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| OS | Android OS, v4.3 (Jelly Bean), upgradable to v4.4.2 (KitKat) | Android OS, v4.2.2 (Jelly Bean) based Color OS | Android OS, v4.4 (KitKat) |
| Processor | Dual-core 1.2 GHz, Intel Atom Z2520 | Dual-core 1.3 GHz | Quad-core 1.5 GHz, LCI L1860C |
| GPU | PowerVR SGX544MP2 | - | Mali-T628 MP4 |
| RAM | 1 GB | 1 GB | 1 GB |
| Internal Memory | 8 GB | 4 GB | 8 GB |
| External Memory | microSD, up to 64 GB | microSD, up to 32 GB | microSD, up to 32 GB |
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| Type | LCD Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 4.0 inches | 4.5 inches | 4.7 inches |
| Resolution | 480 x 800 pixels (233 ppi) | 480 x 854 pixels (218 ppi) | 720 x 1280 pixels (312 ppi) |
| Screen-to-Body Ratio | 59.74% | 64.07% | - |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM Radio | 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 | 8 MP, 3264 x 2448 pixels |
| Flash | No | LED Flash | LED flash |
| Features | Auto focus, Geo-tagging, Panorama | Auto focus, Geo-tagging, Touch Focus, Face Detection, HDR | Auto focus, f/2.2 Aperture, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama, BSI Sensor, Omnivision sensor |
| Video | Yes, 1080p@30fps | Yes | Yes, 1080p |
| Front Camera | Yes, VGA [Similar] | Yes, 2 MP [Similar] | 2 MP, 720p [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps | HSPA+ | HSPA, LTE Cat4 150/50 Mbps |
| Bluetooth | Yes, v4.0 with A2DP, EDR | v2.1, A2DP | v4.0, A2DP |
| Wi-Fi | 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 | Wi-Fi 802.11 b/g/n, hotspot |
| USB | Yes, microUSB v2.0 | microUSB v2.0 | microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS | Yes, with A-GPS, GLONASS, Beidou |
| Browser | HTML | HTML | HTML5 |
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| Internal | 8 GB, 1 GB RAM | 4 GB, 1 GB RAM | 8 GB, 1 GB RAM |
| Expandable Storage | microSD, up to 64 GB | microSD, up to 32 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-Po Battery | Li-Ion Battery | Li-Po Battery |
| Capacity | 1200/1600 mAh | 1900 mAh | 2200 mAh |
| Stand by | Up to 192 h | - | - |
| Talk Time | Up to 10 h | - | - |
