Phone Comparison - HTC Desire 820s dual sim vs Oppo A57 vs Oppo A77 (Mediatek)
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| Manufacturer | HTC | Oppo | Oppo |
| Announced | March 2015 | November 2016 | May 2017 |
| Status | Available - March 2015 | Available - January 2017 | Available - May 2017 |
| Price | Rs. 27,900 ($410.29) [Similarly Priced] | Rs. 14,990 ($240.00) [Similarly Priced] | Rs. 23,580 ($363.00) [Similarly Priced] |
| Colors | Marble White, Milkyway Gray, Monarch Orange, Santorini White, Tu | Gold, Rose Gold | Gold, Rose Gold |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
157.7 x 78.7 x 7.7 mm (6.21 x 3.1 x 0.3 in) |
149.1 x 72.9 x 7.65 mm (5.87 x 2.87 x 0.3 in) |
153.29 x 75.24 x 7.3 mm (6.04 x 2.96 x 0.29 in) |
| Weight | 155 g (5.47 oz) | 147 g (5.19 oz) | 153 g (5.4 oz) |
| SIM Type | - | Dual-SIM | Dual SIM (Nano-SIM, dual stand-by) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 TD-SCDMA 1900 / 2000 |
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 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE 900 / 1800 / 2100 / 2600 TD-LTE 1900 / 2300 / 2500 / 2600 (Bands 1, 3, 7, 8, 38, 39, 40, 41) |
LTE band 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) | LTE |
| Messaging | SMS, MMS, Push Mail, EMail | SMS, MMS, Push Mail, EMail | SMS, MMS, Push Mail, EMail |
| Build Features | - | - Fingerprint Sensor - Metal Build - 2.5D Curved Glass | - Fingerprint Sensor |
| Notification LED | - | Yes | Yes |
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| OS | Android OS, v4.4.4 (KitKat) | Android OS, v6.0 (Marshmallow) | Android OS, v6.0 (Marshmallow) |
| User Interface | - | ColorOS 3.0 | - |
| Processor | Octa-core 1.7 GHz Cortex-A53, Mediatek MT6752 | Octa-core 1.4 GHz Cortex-A53, Qualcomm MSM8940 Snapdragon 435 | Octa-core (4x1.8 GHz Cortex-A53 & 4x1.0 GHz Cortex-A53), MediaTek MT6750T |
| GPU | Mali-T760MP2 | Adreno 505 | Mali-T880 MP2 |
| RAM | 2 GB | 3 GB | 4 GB |
| Internal Memory | 16 GB | 32 GB | 64 GB |
| External Memory | microSD, up to 32 GB | microSD, up to 128 GB (uses SIM 2 slot) | microSD, up to 256 GB (uses SIM 2 slot) |
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| Type | Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.5 inches | 5.2 inches | 5.5 inches |
| Resolution | 720 x 1280 pixels (267 ppi) | 720 x 1280 pixels (282 ppi) | 1080 x 1920 pixels (401 ppi) |
| Screen-to-Body Ratio | 67.20% | 68.79% | 72.13% |
| 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 | Auto focus, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama | Phase Detection Autofocus, f/2.2, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama | Phase Detection Autofocus, f/2.2, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama |
| Video | 1080p@30fps | 1080p@30fps | 1080p@30fps |
| Front Camera | 8 MP, 1080p [Similar] | 16 MP [Similar] | 16 MP, f/2.0 [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps | HSPA, LTE, VoLTE | HSPA, LTE, VoLTE |
| Bluetooth | v4.0, A2DP | v4.1, A2DP | 4.2, A2DP |
| Wi-Fi | Wi-Fi 802.11 b/g/n, hotspot | Wi-Fi 802.11 a/b/g/n, hotspot | Wi-Fi 802.11 b/g/n, hotspot |
| USB | microUSB v2.0 | microUSB v2.0, USB Host | microUSB 2.0 |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS | Yes, with A-GPS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 16 GB, 2 GB RAM | 32 GB, 3 GB RAM | 64 GB, 4 GB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 128 GB (uses SIM 2 slot) | 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 | Non-removable Li-Po Battery | Non-removable Li-Ion Battery | Non-removable Li-Ion Battery |
| Capacity | 2600 mAh | 2900 mAh | 3200 mAh |
| Stand by | Up to 560 h (3G) | - | - |
| Talk Time | Up to 12 h 10 min (3G) | - | - |
