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Xiaomi Mi 4i vs Vivo Y28 8GB

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), 8(900), 28(700), 38(2600), 40(2300), 41(2500)  
Dimensions 138.1 x 69.6 x 7.8 mm 165.7 x 76 x 8 mm  
Sim Type Dual Sim, Hybrid Dual SIM (Nano-SIM)  
Weight 130 g 199 g  
Display Type IPS LCD capacitive touchscreen, 16M colors, MUltitouch, MIUI 7.0 IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz, 760 nits (typ), 1000 nits (HBM)  
Display Size 5.0 inches, 1080 x 1920 pixels (~441 ppi pixel density) 6.68 Inches   720 x 1608 Pixels (~264 PPI)  
Protection ACorning scratch-resistant glass
Memory 16GB built-in 128GB Built-in, 8GB RAM (+8GB Extended RAM), UFS 2.2  
Card slot microSDXC (uses shared SIM slot)  
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, 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 + AGPS, 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: 50 MP, f/1.8, (wide), PDAF + 2 MP, f/2.4, (depth), LED Flash   Geo-tagging, Phase detection, Panorama, HDR, Video (1080p@30fps)  
Front Camera 5 MP, f/1.8 8 MP, f/2.1, (wide), Video (1080p@30fps)  
OS Android OS, v5.0.2 (Lollipop) Android 14 OS  
Chipset Qualcomm MSM89 MediaTek Helio G85 SoC  
Processor 1.7 GHz Octa-Core Cortex-A53 2.0 Ghz Octa Core  
GPU GPU: Adreno 405 Mali G57 MP2  
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, 24-bit/192kHz Hi-Res audio, Speaker Phone   Smartphone deals
Colors Dark Gray, Black, White, Yellow, Blue, Pink Agate Green, Gleaming Orange  
Battery 3120 mAh (Non removable), 6000 mAh   - Fast battery 44W 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   Notification LED round light on the back, Glass front, plastic frame, plastic back, IP64 dust/water resistant, Document viewer, Photo/video editor