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Vivo Y21d vs Samsung Galaxy S25 Ultra 512GB

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 / 2100   HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100  
4G Network LTE band 1(2100), 3(1800), 5(850), 8(900), 28(700), 38(2600), 40(2300), 41(2500)   LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 13(700), 17(700), 18(800), 19(800), 20(800), 25(1900), 26(850), 28(700), 32(1500), 38(2600), 39(1900), 40(2300), 41(2500), 66(1700/2100)  
5G Network SA/NSA/Sub6  
Dimensions 166.14 x 77.01 x 8.39 mm   162.8 x 77.6 x 8.2 mm  
Sim Type Nano-SIM + Nano-SIM   Nano-SIM + Nano-SIM + eSIM + eSIM (max 2 at a time)  
Weight 209 g   219 g  
Display Type IPS LCD Capacitive Touchscreen   90Hz, 1000 nits Brightness   Dynamic LTPO AMOLED 2X Capacitive Touchscreen   120Hz, HDR10+, 2600 nits (peak), Always-on display  
Display Size 6.68 Inches   720 x 1608 Pixels (~264 PPI)   6.9 Inches   1440 x 3120 Pixels (~498 PPI)  
Protection Corning Gorilla Armor 2  
Memory 128GB Built-in, 6GB RAM, eMMC 5.1   512GB Built-in, 12GB RAM, UFS 4.0  
Card slot microSD Card, (supports up to 2TB)   No  
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot   Wi-Fi 802.11 a/b/g/n/ac/6e/7, tri-band, Wi-Fi Direct  
BlueTooth v5.2 with A2DP, LE   v5.4 with A2DP, LE  
USB USB Type-C 2.0, OTG   USB Type-C 3.2, DisplayPort 1.2, OTG  
NFC No   Yes  
GPS Yes + A-GPS support & Glonass, BDS, GALILEO, QZSS   Yes + A-GPS support & GLONASS, BDS, GALILEO, QZSS  
Main Camera 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   Quad Camera: 200 MP, f/1.7, 24mm (wide), 1/1.3", multi-directional PDAF, OIS + 10 MP, f/2.4, 67mm (telephoto), 1/3.52", PDAF, OIS, 3x optical zoom + 50 MP, f/3.4, 111mm (periscope telephoto), 1/2.52", PDAF, OIS, 5x optical zoom + 50 MP, f/1.9, (ultrawide), dual pixel PDAF, Super Steady video, LED Flash   Laser AF, Best Face, auto-HDR, panorama, Video (8K@24/30fps, 4K@30/60/120fps, 1080p@30/60/240fps, 10-bit HDR, HDR10+, stereo sound rec., gyro-EIS)  
Front Camera 5 MP   12 MP, f/2.2, 26mm (wide), 1/3.2", dual pixel PDAF, HDR, HDR10+, Video (4K@30/60fps, 1080p@30fps)  
OS Android 15 OS   Android 15 OS, up to 7 major Android upgrades  
Chipset Unisoc T7225 (12 nm)   Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm)  
Processor Octa-Core (2 × 1.8 GHz + 6 × 1.8 GHz)   Octa-core (2 x 4.47 GHz Oryon V2 Phoenix L + 6 x 3.53 GHz Oryon V2 Phoenix M)  
GPU Arm Mali G57   Adreno 830  
Sensors Accelerometer, Compass, Fingerprint (side mounted), Gyro, Proximity   Accelerometer, Barometer, Compass, Fingerprint (under display, ultrasonic), Gyro, Proximity, Samsung DeX, Samsung Wireless DeX (desktop experience support) Ultra Wideband (UWB) support Circle to Search  
Browser HTML5   HTML5  
Sound 3.5mm Audio Jack, Speaker  Phone   Best smartphone 32-bit/384kHz audio, Tuned by AKG, Speaker  Phone  
Colors Coral Red, Jade Green   Titanium Silver Blue, Titanium Black, Titanium White Silver, Titanium Gray, Titanium Jade Green, Titanium Jet Black, Titanium Pink Gold  
Battery Li-ion 6500 mAh   - Fast charging 44W   Li-ion 5000 mAh   - Fast charging 45W wired, PD3.0, 65% in 30 min, 25W wireless (Qi2), 4.5W reverse wireless  
Misc SMS(threaded view), MMS, Email, Push Mail, IM   Document viewer, Photo/video editor   SMS(threaded view), MMS, Email, Push Mail, IM   Glass front + Corning Gorilla Armor 2), glass back + Corning Gorilla Armor 2), titanium frame (grade 5), IP68 dust/water resistant (up to 1.5m for 30 min), Stylus