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HTC Desire 820 vs Oppo A3x 128GB

2G Network GSM 850 / 900 / 1800 / 1900 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), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 157.7 x 78.7 x 7.7 mm 165.8 x 76.1 x 7.7 mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)  
Weight 155 g 186 g  
Display Type LCD capacitive touchscreen, 16M colors, HTC Sense UI v6 IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz, 1000 nits (HBM)  
Display Size 720 x 1280 pixels, 5.5 inches (~267 ppi) 6.67 Inches   720 x 1604 Pixels (~264 PPI)  
Multitouch Yes
Protection Panda Glass  
Memory 16GB built-in 128GB Built-in, 4GB RAM, eMMC 5.1  
Card slot microSD card (supports up to 128GB) microSDXC  
RAM 2GB RAM
GPRS Yes Yes
WLAN WLAN (Wi-Fi 802.11 a/b/g/n Wi-Fi 802.11 a/b/g/n/ac, dual-band  
BlueTooth Bluetooth v4.0 v5.0 with A2DP, LE  
USB USB (microUSB v2.0) USB Type-C 2.0, OTG  
NFC No  
GPS Yes Yes + A-GPS support, & GLONASS, BDS, GALILEO  
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 Camera: 8 MP, f/2.0, (wide), PDAF + Auxiliary lens, LED Flash   HDR, panorama, Video (1080p@30/60fps)  
Front Camera 8MP, 1080p 5 MP, f/2.2, (wide), Video (1080p@30fps)  
OS Android OS, v4.4.2 (KitKat) Android 14 OS  
Chipset Qualcomm MSM89 Qualcomm Snapdragon 6s Gen 1  
Processor 1.5 GHz Quad-Core Cortex-A53, 1.0 GHz Quad-core Cortex-A53 Octa Core  
GPU GPU: Adreno 405 Adreno 610  
Sensors Accelerometer, proximity, compass Accelerometer, Compass, Fingerprint (side-mounted), 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, Speaker Phone  
Colors Marble White, Tuxedo Grey, Santorini White, Milky-way Grey, Tangerine White, Saffron Grey, Flamingo Grey, Blue Misty, Monarch Orange Nebula Red, Ocean Blue  
Battery Talk-Time up to 22 hrs 24 min 2600 mAh (Non removable), 5100 mAh   - Fast battery 45W wired, PD2.0, PPS, 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 Mail, IM   IP54, dust and splash resistant MIL-STD-810H compliant*, * does not guarantee ruggedness or use in extreme conditions, Document editor, Photo/video editor