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HTC Desire 820 vs Vivo Y100

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 / 1700(AWS) / 1900 / 2100  
4G Network LTE 900 / 1800 / 2100 / 2600 LTE band 1(2100), 5(850), 8(900), 40(2300)  
5G Network SA/NSA  
Dimensions 157.7 x 78.7 x 7.7 mm 163.2 x 75.8 x 7.8 mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)  
Weight 155 g 185 g  
Display Type LCD capacitive touchscreen, 16M colors, HTC Sense UI v6 AMOLED Capacitive Touchscreen, 1B, Multitouch   120Hz, 1200 nits (peak)  
Display Size 720 x 1280 pixels, 5.5 inches (~267 ppi) 6.67 Inches   1080 x 2400 Pixels (~395 PPI)  
Multitouch Yes
Memory 16GB built-in 128/256GB Built-in, 8GB RAM, UFS 2.2  
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 Yes  
GPS Yes Yes + AGPS, GLONASS, BDS, GALILEO, BDS, QZSS  
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: 50 MP, f/1.8, (wide), PDAF + 8 MP, f/2.2, (ultrawide), LED Flash   Panorama, HDR, Video (1080p@30fps)  
Front Camera 8MP, 1080p 8 MP, f/1.8, (wide), Video (1080p@30fps(  
OS Android OS, v4.4.2 (KitKat) Android 14 OS  
Chipset Qualcomm MSM89 Qualcomm Snapdragon 4 Gen 2 (4 nm)  
Processor 1.5 GHz Quad-Core Cortex-A53, 1.0 GHz Quad-core Cortex-A53 Octa-core (2 x 2.2 GHz Cortex-A78 + 6 x 1.95 GHz Cortex-A55)  
GPU GPU: Adreno 405 Adreno 613  
Sensors Accelerometer, proximity, compass Accelerometer, Compass, Fingerprint (under display, optical), Gyro, 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) 24-bit/192kHz Hi-Res audio, Speaker Phone  
Colors Marble White, Tuxedo Grey, Santorini White, Milky-way Grey, Tangerine White, Saffron Grey, Flamingo Grey, Blue Misty, Monarch Orange Purple Orchid, Black Onyx  
Battery Talk-Time up to 22 hrs 24 min 2600 mAh (Non removable), 5000 mAh   - Fast battery 80W wired, 1-45% in 15 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   Glass front, plastic or silicone polymer (eco leather) back, IP54, dust and splash resistant, Document viewer, Photo/video editor