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HTC Desire 820 vs Oppo A57

2G Network GSM 850 / 900 / 1800 / 1900 SIM1: SIM1 GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 2100  
4G Network LTE 900 / 1800 / 2100 / 2600 LTE band 1(2100), 3(1800), 5(850), 8(900), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 157.7 x 78.7 x 7.7 mm 163.7 x 75 x 8 mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)  
Weight 155 g 187 g  
Display Type LCD capacitive touchscreen, 16M colors, HTC Sense UI v6 IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   60Hz  
Display Size 720 x 1280 pixels, 5.5 inches (~267 ppi) 6.53 Inches   720 x 1612 Pixels (~270 PPI)  
Multitouch Yes
Memory 16GB built-in 64GB Built-in, 3GB RAM  
Card slot microSD card (supports up to 128GB) microSDXC  
RAM 2GB RAM
GPRS Yes Yes
EDGE Yes
WLAN WLAN (Wi-Fi 802.11 a/b/g/n Wi-Fi 802.11 a/b/g/n/ac, dual-band, hotspot  
BlueTooth Bluetooth v4.0 v5.0 with A2DP, LE  
USB USB (microUSB v2.0) USB-C port  
NFC No  
GPS Yes Yes + A-GPS support  
Main Camera 13MP, 4160 x 3120 pixels, autofocus, LED flash, Geo-tagging, touch focus, face detection, simultaneous HD video and image recording, HDR, Video (1080p@30fps, 720p@60fps), Dual 13 MP, f/2.2, 26mm (wide), 1/3.06", AF + 2 MP, f/2.4, (depth), LED Flash   Geo-tagging, touch focus, face detection, HDR, panorama, Video (1080p@30fps)  
Front Camera 8MP, 1080p 8 MP, f/2.0, (wide), HDR, Video (1080p@30fps)  
OS Android OS, v4.4.2 (KitKat) Android 11 OS  
Chipset Qualcomm MSM89 MediaTek MT6765G Helio G35 (12 nm)  
Processor 1.5 GHz Quad-Core Cortex-A53, 1.0 GHz Quad-core Cortex-A53 Octa-core (4 x 2.3 GHz Cortex-A53 + 4 x 1.8 GHz Cortex-A53)  
GPU GPU: Adreno 405 PowerVR GE8320  
Sensors Accelerometer, proximity, compass Accelerometer, Compass, FingerPrint, Proximity  
Browser HTML5 HTML5  
Sound 3.5mm audio jack, MP4/H.263/H.264/WMV player, MP3/eAAC+/WMA/WAV player, SNS integration, YouTube, Google Talk, Games (built-in + downloadable) 3.5mm Audio Jack, MP4/H.264/FLAC player, MP3/eAAC+/WAV player, Speaker Phone  
Colors Marble White, Tuxedo Grey, Santorini White, Milky-way Grey, Tangerine White, Saffron Grey, Flamingo Grey, Blue Misty, Monarch Orange Glowing Green, Glowing Black  
Battery Talk-Time up to 22 hrs 24 min 2600 mAh (Li-Po Non removable), 5000 mAh   - Fast charging 33W, 50% in 30 min (advertised)  
StandBy Time Stand-by up to 424 hrs
Misc GPS + A-GPS support & GLONASS, Document editor, Photo viewer/editor, Google Search, Maps, Gmail, Voice memo/dial/commands, Predictive text input, YouTube, Calendar, Speakerphone SMS (threaded view), MMS, Email, Push Email   IPX4 water resistant, IP5X dust resistant ,Glass front, Plastic frame, Plastic back, Document viewer, Photo/video editor