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HTC One M9 vs Oppo A6x

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 / 1900 / 2100  
4G Network LTE 700 / 800 / 850 / 900 / 1800 / 2100 / 2600 LTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 144.3 x 69.4 x 9.6 mm 166.6 x 78.5 x 8.6 mm  
Sim Type Nano-SIM + Nano-SIM  
Weight 157 g 210 g  
Display Type Super LCD3 capacitive touchscreen, 16M colors, HTC Sense UI 7.0 IPS LCD Capacitive Touchscreen   120Hz, 1125 nits (HBM)  
Display Size 1080 x 1920 pixels, (~441 ppi pixel density), 5.0 inches (~68.4% screen to body ratio) 6.75 Inches   720 x 1570 Pixels (~256 PPI)  
Multitouch Yes
Protection Corning Gorilla Glass 4
Memory 32GB built-in 128GB Built-in, 6GB RAM, UFS 2.2  
Card slot microSD card(support up to 128GB) microSD Card, (supports up to 256GB)  
RAM 3GB RAM
GPRS Yes
WLAN WLAN (Wi-Fi 802.11 a/b/g/n/ac Wi-Fi 802.11 a/b/g/n/ac, dual-band  
BlueTooth Bluetooth v4.0 with A2DP v5.0 with A2DP, LE  
USB USB (microUSB v2.0 (MHL 3.0 TV-out), USB Host) USB Type-C 2.0, OTG  
NFC No  
GPS Yes Yes + A-GPS support & Glonass, BDS, GALILEO, QZSS  
Main Camera 20.7 MP, 5376 x 3752 pixels, autofocus, dual-LED (dual tone) flash, Automatic simultaneous video and image recording, geo-tagging, face/smile detection, HDR, panorama, Video (2160p@30fps, 1080p@60fps, 720p@120fps, HDR, stereo sound rec), 13 MP, f/2.2, (wide), AF, LED Flash   HDR, Panorama, Video (1080p@30/60fps)  
Front Camera 4 MP, 1080p@30fps, HDR 5 MP, f/2.2, (wide), Video (1080p@30fps)  
OS Android OS, v5.0.1 (Lollipop) Android 15 OS  
Chipset Qualcomm MSM89 Qualcomm SM6225 Snapdragon 685 (6 nm)  
Processor 1.5 GHz Quad-core Cortex-A53 + 2 GHz Quad-core Cortex-A57 Octa-core (4 x 2.8 GHz Cortex-A73 + 4 x 1.9 GHz Cortex-A53)  
GPU GPU: Adreno 430 Adreno 610  
Sensors Accelerometer, gyro, proximity, compass Accelerometer, Compass, Fingerprint (side-mounted), Proximity  
Browser HTML5 HTML5  
Sound Stereo FM radio with RDS, 3.5mm audio jack, DivX/XviD/MP4/H.264/WMV player, MP3/eAAC+/WMA/WAV/FLAC player, Google Drive (100 GB cloud storage), SNS integration, YouTube, Google Talk, Games (built-in + downloadable) 3.5mm Audio Jack, Speaker Phone  
Colors Gunmetal Gray, Amber Gold, Silver/Rose gold, Gold/Pink Violet Purple, Plum Purple  
Battery Talk-time Up to 25 hrs 20 min 2840 mAh 6500 mAh   - 5W reverse wired  
StandBy Time Stand-by Up to 391 hrs
TalkTime Talk-time Up to 25 hrs 20 min 2840 mAh
Misc GPS + A-GPS support & GLONASS, Nano Sim, Active noise cancellation with dedicated mic, Document editor, Fast battery charging: 60% in 30 min (Quick Charge 2.0), 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   IP64 dust tight and water resistant (water splashes)