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HTC U Ultra vs Oppo A3x

2G Network SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900   SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100   HSDPA 850 / 900 / 2100  
4G Network LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700), 20(800), 28(700), 38(2600), 39(1900), 40(2300), 41(2500)   LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 162.4 x 79.8 x 8 mm   165.8 x 76.1 x 7.7 mm  
Sim Type Dual-SIM, Dual Standby, Nano-SIM   Dual Sim, Dual Standby (Nano-SIM)  
Weight 170 g   186 g  
Display Type Super LCD5 capacitive touchscreen, 16M colors, Multitouch   IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz, 1000 nits (HBM)  
Display Size 1440 x 2560 pixels (~513 PPI pixel density)   6.67 Inches   720 x 1604 Pixels (~264 PPI)  
Protection Corning Gorilla Glass 5 in (64 GB), Sapphire crystal glass in (128 GB)   Panda Glass  
Memory 64/128GB built-in, 4GB RAM   64GB Built-in, 4GB RAM, UFS 2.2  
Card slot microSD Card (support up to 256GB) (uses SIM 2 slot)   microSDXC  
GPRS Yes Yes
EDGE Yes
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, DLNA, hotspot   Wi-Fi 802.11 a/b/g/n/ac, dual-band  
BlueTooth v4.2 with A2DP, LE   v5.0 with A2DP, LE  
USB v3.1, Type-C 1.0 reversible connector   USB Type-C 2.0, OTG  
NFC Yes   No  
GPS Yes + A-GPS support & Glonass   Yes + A-GPS support, & GLONASS, BDS, GALILEO  
Main Camera F/1.8, 26mm, OIS, laser & phase detection, 1/2.3'' sensor size, 1.55µm pixel size, geo-tagging, touch focus, face detection, Auto-HDR, panorama, Video ([email protected] (24-bit/192kHz audio), [email protected])   Dual Camera: 8 MP, f/2.0, (wide), PDAF + Auxiliary lens, LED Flash   HDR, panorama, Video (1080p@30/60fps)  
Front Camera 16 MP, 1080p, Auto-HDR   5 MP, f/2.2, (wide), Video (1080p@30fps)  
OS Android OS, v7.0 (Nougat)   Android 14 OS  
Chipset Qualcomm MSM8996 Snapdragon 821   Qualcomm Snapdragon 6s Gen 1  
Processor Quad-core (2 x 2.15 GHz Kryo + 2 x 1.6 GHz Kryo))   Octa-Core  
GPU Adreno 530   Adreno 610  
Sensors Accelerometer, gyro, proximity, compass, Fingerprint (rear-mounted)   Accelerometer, Compass, Fingerprint (side-mounted), Proximity  
Browser HTML5   HTML5  
Sound Speakerphone   3.5mm Audio Jack, Speaker Phone  
Colors Brilliant Black, Cosmetic Pink, Ice White, Sapphire Blue   Nebula Red, Ocean Blue  
Battery - Non-removable   (Non removable), 5100 mAh   - Fast battery 45W wired, PD2.0, PPS, 50% in 30 min (advertised)  
Misc Active noise cancellation with dedicated mic, Fast battery charging (Quick Charge 3.0), Document editor, Photo video/editor, Google Search, Maps, Gmail, YouTube, Calendar, MP4/H.264 player, MP3/eAAC+/WAV/Flac player, 24-bit/192kHz audio, YouTube, Google Talk   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