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Xiaomi Mi 4i vs Oppo A3x 128GB

2G Network SIM1: GSM 850 / 900 / 1800 / 1900 SIM2: GSM 850 / 900 / 1800 / 1900 SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 1900 / 2100 HSDPA 850 / 900 / 2100  
4G Network LTE band 3(1800), 7(2600), 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 138.1 x 69.6 x 7.8 mm 165.8 x 76.1 x 7.7 mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)  
Weight 130 g 186 g  
Display Type IPS LCD capacitive touchscreen, 16M colors, MUltitouch, MIUI 7.0 IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz, 1000 nits (HBM)  
Display Size 5.0 inches, 1080 x 1920 pixels (~441 ppi pixel density) 6.67 Inches   720 x 1604 Pixels (~264 PPI)  
Protection ACorning scratch-resistant glass Panda Glass  
Memory 16GB built-in 128GB Built-in, 4GB RAM, eMMC 5.1  
Card slot microSDXC  
RAM 2GB RAM
GPRS Yes 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 v4.1 with A2DP v5.0 with A2DP, LE  
USB USB (microUSB v2.0, USB Host) USB Type-C 2.0, OTG  
NFC No  
GPS Yes Yes + A-GPS support, & GLONASS, BDS, GALILEO  
Main Camera 13 MP, f/2.0, autofocus, dual-LED (dual tone) flash, Geo-tagging, touch focus, face/smile detection, panorama, HDR, Video (1080p@30fps, 480p@120fps), Dual Camera: 8 MP, f/2.0, (wide), PDAF + Auxiliary lens, LED Flash   HDR, panorama, Video (1080p@30/60fps)  
Front Camera 5 MP, f/1.8 5 MP, f/2.2, (wide), Video (1080p@30fps)  
OS Android OS, v5.0.2 (Lollipop) Android 14 OS  
Chipset Qualcomm MSM89 Qualcomm Snapdragon 6s Gen 1  
Processor 1.7 GHz Octa-Core Cortex-A53 Octa Core  
GPU GPU: Adreno 405 Adreno 610  
Sensors Accelerometer, gyro, proximity, compass Accelerometer, Compass, Fingerprint (side-mounted), Proximity  
Browser HTML5 HTML5  
Sound FM radio, 3.5mm audio jack, XviD/DivX/MP4/H.265 player, MP3/WAV/eAAC+/FLAC player, YouTube, Google Talk, Games (built-in + downloadable) 3.5mm Audio Jack, Speaker Phone  
Colors Dark Gray, Black, White, Yellow, Blue, Pink Nebula Red, Ocean Blue  
Battery 3120 mAh (Non removable), 5100 mAh   - Fast battery 45W wired, PD2.0, PPS, 50% in 30 min (advertised)  
Misc GPS + A-GPS support & GLONASS, BDS, Dual SIM + Micro-SIM, dual stand-by), Fast battery charging: 40% in 60 min (Quick Charge 2.0), Active noise cancellation with dedicated mic, Photo/video editor, Document viewer, Google Search, Maps, Gmail, Document viewer, 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