Phone Comparison - HTC Desire 820 vs HTC Butterfly 3 vs HTC U Ultra
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| Manufacturer | HTC | HTC | HTC |
| Announced | September 2014 | September 2015 | January 2017 |
| Status | Coming Soon - September 2014 | Coming Soon - October 2015 | Available - January 2017 |
| Price | - | Rs. 24,401 ($358.00) [Similarly Priced] | Rs. 51,000 ($750.00) [Similarly Priced] |
| Colors | Marble White, Tuxedo Grey, Santorini White, Milky-way Grey, Tang | Blue, Red, White | Various |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
157.7 x 78.7 x 7.7 mm (6.21 x 3.1 x 0.3 in) |
151 x 73 x 10 mm (5.94 x 2.87 x 0.39 in) |
162.41 x 79.79 x 7.99 mm (6.39 x 3.14 x 0.31 in) |
| Weight | 155 g (5.47 oz) | 161 g (5.68 oz) | 170g (6oz) |
| SIM Type | - | - | Dual SIM (Nano-SIM, dual stand-by) |
| 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 - EMEA version HSDPA 900 / 2100 - Asia version |
HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE 900 / 1800 / 2100 / 2600 - EMEA version | LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 28(700), 38(2600), 40(2300), 41(2500) | LTE |
| Messaging | SMS, MMS, Push Mail, EMail | SMS, MMS, Push Mail, EMail | SMS, MMS, EMail, IM |
| Build Features | - | - | - Fingerprint Sensor - 2-inch secondary 160x1040 pixels display |
| Notification LED | - | - | Yes |
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| OS | Android OS, v4.4.2 (KitKat) | Android OS, v5.0 (Lollipop) | Android OS, v7.0 (Nougat) |
| Processor | Quad-core 1.5 GHz Cortex-A53 & quad-core 1.0 GHz Cortex-A53, Qualcomm MSM8939 Snapdragon 615 | Quad-core 1.5 GHz Cortex-A53 & Quad-core 2 GHz Cortex-A57, Qualcomm MSM8994 Snapdragon 810 | Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo), Qualcomm MSM8998 Snapdragon 835 |
| GPU | Adreno 405 | Adreno 430 | Adreno 540 |
| RAM | 2 GB | 3 GB | 4 GB |
| Internal Memory | 16 GB | 32 GB | 64/128 GB |
| External Memory | microSD, up to 128 GB | microSD, up to 128 GB | microSD, up to 256 GB |
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| Type | LCD Capacitive Touchscreen | Capacitive touchscreen | IPS LCD Capacitive Touchscreen, Corning Gorilla Glass 5 |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.5 inches | 5.2 inches | 5.7 inches |
| Resolution | 720 x 1280 pixels (267 ppi) | 1440 x 2560 pixels (565 ppi) | 1440 x 2560 pixels (515 ppi) |
| Screen-to-Body Ratio | 67.20% | 67.59% | 69.20% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | No | No |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 13 MP, 4160 x 3120 pixels | 20.2 MP Duo, autofocus | 12 MP, 4608 x 2592 pixels |
| Flash | LED flash | dual-LED (dual tone) | Dual-LED (dual Tone) |
| Features | Auto focus, Geo-tagging, Touch Focus, Face Detection, Simultaneous HD Video And Image Recording, HDR | Geo-tagging, Touch Focus, Face Detection, Panorama, HDR | PDAF, Laser AF, 1.55-micron pixel, f/.1.8, OIS, Geo-tagging, Touch Focus, Face Detection, HDR, Panorama |
| Video | 1080p@30fps, 720p@60fps | 2160p@30fps | 2160p@30fps, 1080p@30fps |
| Front Camera | 8 MP, 1080p [Similar] | 13 MP, 1080p@30fps [Similar] | 16 MP [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 42 Mbps; HSUPA, 5.8 Mbps; LTE, Cat4, 50 Mbps UL, 150 Mbps DL | HSPA, LTE | HSPA, LTE, VoLTE |
| Bluetooth | v4.0, A2DP | v4.1, A2DP, apt-X | v4.2, A2DP, LE, ANT+ |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, DLNA, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot |
| USB | microUSB v2.0 | microUSB v2.0 (MHL 3.0 TV-out) | Type-C 1.0 reversible connector |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS, Beidou | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 16 GB, 2 GB RAM | 32 GB, 3 GB RAM | 64/128 GB, 4 GB RAM |
| Expandable Storage | microSD, up to 128 GB | microSD, up to 128 GB | microSD, up to 256 GB |
| USB OTG | - | - | 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-Po Battery |
| Capacity | 2600 mAh | 2700 mAh | 3000 mAh |
| Stand by | Up to 424 h (3G) | Up to 363 h (2G) Up to 416 h (3G) |
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| Talk Time | Up to 22 h 24 min (3G) | Up to 26 h (2G) Up to 21 h (3G) |
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