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Sony Xperia X Premium vs Vivo Y21d 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 800 / 850 / 900 / 1700 HSDPA 850 / 900 / 2100  
4G Network LTE LTE band 1(2100), 3(1800), 5(850), 8(900), 28(700), 38(2600), 40(2300), 41(2500)  
Dimensions N/a 166.14 x 77.01 x 8.39 mm  
Sim Type Nano-SIM + Nano-SIM  
Weight N/a 209 g  
Display Type IPS HDR LCD capacitive touchscreen, 1.07 billion colors, Scratch-resistant glass, oleophobic coating, 10-bit color (1024 shades of grey), Triluminos display, Triluminos display IPS LCD Capacitive Touchscreen   90Hz, 1000 nits Brightness  
Display Size 5.5 inches, 2160 x 3840 pixels (~801 ppi pixel density) 6.68 Inches   720 x 1608 Pixels (~264 PPI)  
Multitouch Yes
Memory 32/64GB built-in 3GB RAM 128GB Built-in, 8GB RAM, eMMC 5.1  
Card slot microSD Card, (supports up to 2TB)  
GPRS Yes
WLAN WLAN (Wi-Fi 802.11 a/b/g/n/ac Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot  
BlueTooth Bluetooth v4.2 with A2DP v5.2 with A2DP, LE  
USB USB (v3.0 USB Type-C 2.0, OTG  
NFC No  
GPS Yes Yes + A-GPS support & Glonass, BDS, GALILEO, QZSS  
Main Camera 23 MP, f/2.0, 24mm, phase detection autofocus, LED flash, 1/2.3" sensor size, geo-tagging, touch focus, face detection, HDR, panorama, Video, Dual Camera: 50 MP, f/1.8 + 0.08 MP, f/2.2, LED Flash   Night, Portrait, Video, Live Photo, Slo-mo, Time-lapse, Panorama, Video  
Front Camera b 13 MP, f/2.0, 22mm, 1/3" sensor size, 1080p, HDR 5 MP  
OS Android OS, v6.0.1 (Marshmallow) Android 15 OS  
Chipset Qualcomm MSM89 Unisoc T7225 (12 nm)  
Processor 2.15 GHz Dual-Core Kryo, 1.6 GHz Dual-Core Kryo Octa-Core (2 × 1.8 GHz + 6 × 1.8 GHz)  
GPU GPU: Adreno 530 Arm Mali G57  
Sensors Aaccelerometer, gyro, proximity, barometer, compass, Fingerprint Accelerometer, Compass, Fingerprint (side mounted), Gyro, Proximity  
Browser HTML5 HTML5  
Sound 3.5mm audio jack, Xvid/MP4/H.265 player, MP3/eAAC+/WAV/WMA player, SNS integration, Games (built-in + downloadable) 3.5mm Audio Jack, Speaker Phone  
Colors White, Graphite Black, Lime Gold, Rose Gold Coral Red, Jade Green  
Battery Non-removable battery Li-ion 6500 mAh   - Fast charging 44W  
Misc GPS + A-GPS, support, GLONASS, Active noise cancellation with dedicated mic, Single SIM + Nano-SIM) or Dual SIM + Nano-SIM, dual stand-by), Organizer, Document viewer, Voice memo/dial, Photo/video editor SMS(threaded view), MMS, Email, Push Mail, IM   Document viewer, Photo/video editor