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Vivo Y21d vs Samsung Galaxy Z Flip 8

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), 14(700), 17(700), 18(800), 19(800), 20(800), 25(1900), 26(850), 28(700), 29(700), 30(2300), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500), 46(5200), 66(1700/2100), 71(600)  
5G Network SA/NSA/Sub6  
Dimensions 166.14 x 77.01 x 8.39 mm   N/A  
Sim Type Nano-SIM + Nano-SIM   Nano-SIM + multiple eSIM (max 2 at a time)  
Weight 209 g   N/A  
Display Type IPS LCD Capacitive Touchscreen   90Hz, 1000 nits Brightness   Foldable Dynamic LTPO AMOLED 2X Capacitive Touchscreen   120Hz, HDR10+, 2600 nits (peak), Cover display: 4.1 inches, 948 x 1048 pixels (Gorilla Glass Victus 2) Super AMOLED, 120Hz, 2600 nits (peak)  
Display Size 6.68 Inches   720 x 1608 Pixels (~264 PPI)   7.0 Inches   1080 x 2520 Pixels (~392 PPI)  
Memory 128GB Built-in, 6GB RAM, eMMC 5.1   256/512GB 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   v6.0 with A2DP, LE  
USB USB Type-C 2.0, OTG   USB Type-C 3.2, 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   Dual Camera: 50 MP, f/1.8, 23mm (wide), 1/1.57", dual pixel PDAF, OIS + 12 MP, f/2.2, 13mm, (ultrawide), 1/3.2", LED Flash   HDR, panorama, Video (4K@30/60fps, 1080p@60/120/240fps, 720p@960fps, HDR10+)  
Front Camera 5 MP   12 MP  
OS Android 15 OS   Android 17 OS  
Chipset Unisoc T7225 (12 nm)   Exynos 2500 (3 nm)  
Processor Octa-Core (2 × 1.8 GHz + 6 × 1.8 GHz)   3.3 Ghz Octa Core  
GPU Arm Mali G57   Xclipse 950  
Sensors Accelerometer, Compass, Fingerprint (side mounted), Gyro, Proximity   Accelerometer, Barometer, Compass, Fingerprint (side mounted), Gyro, Proximity, Circle to Search  
Browser HTML5   HTML5  
Sound 3.5mm Audio Jack, Speaker  Phone   Best smartphone 32-bit/384kHz audio, Speaker  Phone  
Colors Coral Red, Jade Green   Various  
Battery Li-ion 6500 mAh   - Fast charging 44W   4700 mAh   - Fast charging 25W  
Misc SMS(threaded view), MMS, Email, Push Mail, IM   Document viewer, Photo/video editor   SMS(threaded view), MMS, Email, Push Mail, IM   IP48 dust and water resistant (dust > 1mm; immersible up to 1.5m for 30 min), Armor aluminum frame, Plastic front (unfolded), glass back + Gorilla Glass Victus 2), Aluminum frame