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Xiaomi Mi 4i vs Oppo Reno 15

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 800 / 850 / 900 / 1700(AWS) / 1900 / 2100  
4G Network LTE band 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700), 20(800), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
5G Network SA/NSA  
Dimensions 138.1 x 69.6 x 7.8 mm 158 x 74.8 x 7.77mm (Twilight Blue), 7.89mm (Aurora White)  
Sim Type Nano-SIM + Nano-SIM + eSIM (max 2 at a time)  
Weight 130 g 197 g  
Display Type IPS LCD capacitive touchscreen, 16M colors, MUltitouch, MIUI 7.0 AMOLED Capacitive Touchscreen, 1B Colors   120Hz, HDR10+, 600 nits (typ), 1200 nits (HBM)  
Display Size 5.0 inches, 1080 x 1920 pixels (~441 ppi pixel density) 6.59 Inches   1256 x 2760 Pixels (~460 PPI)  
Protection ACorning scratch-resistant glass Corning Gorilla Glass 7i  
Memory 16GB built-in 256GB Built-in, 12GB RAM, UFS 3.1  
Card slot No  
RAM 2GB 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 v4.1 with A2DP v5.4 with A2DP, LE, aptX HD, LHDC 5  
USB USB (microUSB v2.0, USB Host) USB Type-C 2.0, OTG  
NFC Yes  
GPS Yes Yes + GPS, GLONASS, GALILEO, BDS, QZSS  
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), Triple Camera: 50 MP, f/1.8, 26mm (wide), PDAF, OIS + 50 MP, f/2.8, 80mm (telephoto), PDAF, OIS, 3.5x optical zoom + 8 MP, f/2.2, 15mm, (ultrawide), 1/4.0", AF, LED Flash   Color spectrum sensor, HDR, panorama, Video (4K@30/60fps, 1080p@30/60/120fps, gyro-EIS, HDR)  
Front Camera 5 MP, f/1.8 50 MP, f/2.0, 18mm (ultrawide), AF, Panorama, HDR, Video (4K@30/60fps, 1080p@30/60fps, gyro-EIS, HDR)  
OS Android OS, v5.0.2 (Lollipop) Android 16 OS  
Chipset Qualcomm MSM89 Qualcomm SM7750-AB Snapdragon 7 Gen 4 (4 nm)  
Processor 1.7 GHz Octa-Core Cortex-A53 Octa-core (1 x 2.8 GHz Cortex-720 + 4 x 2.4 GHz Cortex-720 + 3 x 1.8 GHz Cortex-520)  
GPU GPU: Adreno 405 Adreno 722  
Sensors Accelerometer, gyro, proximity, compass Accelerometer, Compass, Fingerprint (under display, optical), Gyro, Proximity, BeaconLink calls via bluetooth, up to 200m  
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) Speaker Phone  
Colors Dark Gray, Black, White, Yellow, Blue, Pink Twilight Blue, Aurora White  
Battery 3120 mAh 6500 mAh   - Fast battery 80W wired, 80W UFCS, 55W PPS, 13.5W PD, 13.5W QC, 100% in 50 min, Reverse wired  
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   NFC (market/region dependent), Glass front + Gorilla Glass 7i), aluminum frame, glass back, IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min)