Phone Comparison - Xiaomi Mi 4i vs Oppo R9s vs Oppo A77
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| Manufacturer | Xiaomi | Oppo | Oppo |
| Announced | April 2015 | October 2016 | July 2017 |
| Status | Available - April 2015 | Available - October 2016 | Available - July 2017 |
| Price | Rs. 8,999 ($132.34) [Similarly Priced] | Rs. 27,700 ($415.00) [Similarly Priced] | - |
| Colors | Black, White, Blue, Yellow, Pink | Silver, Gold | Gold, Rose Gold |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
138.1 x 69.6 x 7.8 mm (5.44 x 2.74 x 0.31 in) |
153 x 74.3 x 6.58 mm (6.02 x 2.93 x 0.26 in) |
153.3 x 75.9 x 7.4 mm (6.04 x 2.99 x 0.29 in) |
| Weight | 130 g (4.59 oz) | 145 g (5.11 oz) | 148 g (5.22 oz) |
| SIM Type | - | - | Dual SIM (Nano-SIM, dual stand-by) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 / 800 - Taiwan | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE | LTE band 1(2100), 2(1900), 3(1800), 5(850), 7(2600), 8(900), 18(800), 19(800), 26(850), 28(700), 38(2600), 39(1900), 40(2300), 41(2500) - Taiwan | LTE |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail |
| Build Features | - | - Fingerprint Sensor - Metal Build | - Fingerprint Sensor |
| Notification LED | - | - | Yes |
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| OS | Android OS, v5.0 (Lollipop) | Android OS, v6.0.1 (Lollipop) | Android OS, v7.0 (Nougat) |
| Processor | Quad-core 1.7 GHz Cortex-A53 & quad-core 1.0 GHz Cortex-A53, Qualcomm MSM8939 Snapdragon 615 | Octa-core 2.0 GHz Cortex-A53, Qualcomm MSM8953 Snapdragon 625 | Octa-core 2.0 GHz Cortex-A53, Qualcomm MSM8953 Snapdragon 625 |
| GPU | Adreno 405 | Adreno 506 | Adreno 506 |
| RAM | 2 GB | 4 GB | 4 GB |
| Internal Memory | 16/32 GB | 64 GB | 64 GB |
| External Memory | No | microSD, up to 128 GB | microSD, up to 256 GB (uses SIM 2 slot) |
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| Type | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen, 2.5D Curved Glass Display, Corning Gorilla Glass 5 | IPS LCD Capacitive Touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.0 inches | 5.5 inches | 5.5 inches |
| Resolution | 1080 x 1920 pixels (441 ppi) | 1080 x 1920 pixels (401 ppi) | 1080 x 1920 pixels (401 ppi) |
| Screen-to-Body Ratio | 71.57% | 73.19% | 71.50% |
| 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 | 13 MP, 4128 x 3096 pixels | 16 MP | 13 MP |
| Flash | LED flash | LED Flash | LED Flash |
| Features | Auto focus, Geo-tagging, Touch Focus, Face/smile Detection, Panorama, HDR | AutoFocus, Sony IMX398 Sensor, f/1.7 aperture, EIS, 6P Lens, Geo-tagging, Touch Focus, Face Detection, Panorama, HDR | Phase Detection Autofocus, f/2.2, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama |
| Video | 1080p@30fps | 1080p@30fps | 1080p@30fps |
| Front Camera | 5 MP [Similar] | 16 MP, f/2.0 [Similar] | 16 MP, f/2.0 [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSPA, LTE | HSPA 42.2/5.76 Mbps, LTE Cat6 300/50 Mbps | HSPA, LTE, VoLTE |
| Bluetooth | v4.0, A2DP | v4.2, A2DP, EDR, LE | 4.2, A2DP |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, dual-band, hotspot | Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot | Wi-Fi 802.11 b/g/n, hotspot |
| USB | microUSB v2.0 | microUSB v2.0, USB OTG, VOOC Flash Charge | microUSB 2.0 |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 16/32 GB, 2 GB RAM | 64 GB, 4 GB RAM | 64 GB, 4 GB RAM |
| Expandable Storage | No | microSD, up to 128 GB | microSD, up to 256 GB (uses SIM 2 slot) |
| USB OTG | - | Supported | Not 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 | Non-removable Li-Ion Battery | Non-removable Li-Ion Battery |
| Capacity | 3120 mAh | 3010 mAh | 3200 mAh |
| Stand by | - | - | - |
| Talk Time | - | - | - |
