Phone Comparison - Vivo Y66 vs Oppo A57 vs vivo Y55s
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| Manufacturer | vivo | Oppo | vivo |
| Announced | December 2016 | November 2016 | February 2017 |
| Status | Available - December 2016 | Available - January 2017 | Coming Soon - February 2017 |
| Price | Rs. 14,990 ($216.00) [Similarly Priced] | Rs. 14,990 ($240.00) [Similarly Priced] | - |
| Colors | Gold | Gold, Rose Gold | Crown Gold, Space Gray |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
153.56 x 75.79 x 7.49 mm (6.05 x 2.98 x 0.29 in) |
149.1 x 72.9 x 7.65 mm (5.87 x 2.87 x 0.3 in) |
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| Weight | 157 g (5.54 oz) | 147 g (5.19 oz) | - |
| SIM Type | Dual SIM Hybrid (Nano SIM + Micro SIM, or Micro SIM + microSD Card) | Dual-SIM | Dual SIM |
| 2G Network | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA2000 1xEV-DO |
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA2000 1xEV-DO - A59m |
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 900 / 2100 |
| 4G Network | LTE band 1(2100), 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) | LTE band 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) | LTE band 3(1800), 5(850), 40(2300) |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail | SMS, MMS, EMail, IM |
| Build Features | - Metal Body - 2.5D Curved Glass |
- Fingerprint Sensor - Metal Build - 2.5D Curved Glass | - |
| Notification LED | Yes | Yes | No |
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| OS | Android OS, v6.0.1 (Marshmallow) | Android OS, v6.0 (Marshmallow) | Android OS, v6.0 (Marshmallow) |
| User Interface | FunTouch OS 3.0 | ColorOS 3.0 | - |
| Processor | Octa-core 1.4 GHz Cortex-A53, Qualcomm MSM8937 Snapdragon 430 | Octa-core 1.4 GHz Cortex-A53, Qualcomm MSM8940 Snapdragon 435 | Quad-core 1.2 GHz Cortex-A53, Qualcomm MSM8917 Snapdragon 425 |
| GPU | Adreno 505 | Adreno 505 | Adreno 306 |
| RAM | 3 GB | 3 GB | 3 GB |
| Internal Memory | 32 GB | 32 GB | 16 GB |
| External Memory | microSD, up to 128 GB | microSD, up to 128 GB (uses SIM 2 slot) | microSD, up to 256 GB (dedicated slot) |
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| Type | IPS LCD capacitive touchscreen | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.5 inches | 5.2 inches | 5.2 inches |
| Resolution | 720 x 1280 pixels (267 ppi) | 720 x 1280 pixels (282 ppi) | 720 x 1280 pixels (282 ppi) |
| Screen-to-Body Ratio | 71.66% | 68.79% | - |
| 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, 4160 x 3120 pixels | 13 MP | 13 MP |
| Flash | LED Flash | LED Flash | LED Flash |
| Features | AutoFocus, Geo-tagging, Touch Focus, Face/smile Detection, HDR, Panorama | Phase Detection Autofocus, f/2.2, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama | Autofocus, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama |
| Video | 1080p@30fps | 1080p@30fps | 1080p@30fps |
| Front Camera | 5 MP [Similar] | 16 MP [Similar] | 5 MP [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSPA, LTE, EV-DO Rev.A 3.1 Mbps, VoLTE | HSPA, LTE, VoLTE | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps, VoLTE |
| Bluetooth | v4.1, A2DP | v4.1, A2DP | v4.0, A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot | Wi-Fi 802.11 a/b/g/n, hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| USB | microUSB v2.0 | microUSB v2.0, USB Host | microUSB v2.0 |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS | Yes, with A-GPS, BDS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 32 GB, 3 GB RAM | 32 GB, 3 GB RAM | 16 GB, 3 GB RAM |
| Expandable Storage | microSD, up to 128 GB | microSD, up to 128 GB (uses SIM 2 slot) | microSD, up to 256 GB (dedicated slot) |
| USB OTG | Supported | Supported | Not Supported |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| Light Sensor | |
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| Magnetic-Field Sensor (Compass) | |
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| NFC | |
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| Type | Non-removable Li-Ion Battery | Non-removable Li-Ion Battery | Non-removable Li-Ion Battery |
| Capacity | 3000 mAh | 2900 mAh | 2730 mAh |
| Stand by | - | - | - |
| Talk Time | - | - | - |
