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Samsung Galaxy S21 vs Samsung Galaxy Z Flip 4

2G Network SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900   SIM1: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100   HSDPA 850 / 900 / 1900 / 2100  
4G Network 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)   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 5G SA/NSA   SA/NSA/Sub6/mmWave  
Dimensions 151.7 x 71.2 x 7.9 mm   Unfolded: (165.2 x 71.9 x 6.9 mm), Folded: (84.9 x 71.9 x 15.9-17.1 mm)  
Sim Type Dual Sim, Dual Standby, eSIM (Nano-SIM)   eSIM (Nano-SIM)  
Weight 171 g   87 g  
Display Type Eye Comfort Shield, Always-on display, 120Hz, HDR10+, 1300 nits (peak)   Foldable Dynamic AMOLED 2X Capacitive Touchscreen, Multitouch   120Hz, HDR10+, 1200 nits (peak) Cover display: Super AMOLED, 1.9 inches, 260 x 512 pixels, (Gorilla Glass Victus+)  
Display Size 1080 x 2400 Pixels (~424 PPI)   6.7 Inches   1080 x 2640 Pixels (~426 PPI)  
Protection Corning Gorilla Glass Victus   To be confirmed  
Memory 128/256GB Built-in, 8GB RAM, UFS 3.1   128/256/512GB Built-in, 8GB RAM, UFS 3.1  
Card slot No   No  
GPRS Yes Yes
WLAN Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct, hotspot   Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct, hotspot  
BlueTooth v5.0 with A2DP, LE   v5.2 with A2DP, LE  
USB USB Type-C 3.2, USB On-The-Go   USB Type-C 2.0, USB On-The-Go  
NFC Yes   Yes  
GPS Yes + A-GPS support & Glonass, BDS, GALILEO   Yes + AGPS, GLONASS, BDS, GALILEO  
Main Camera Geo-tagging, touch focus, face/smile detection, Auto HDR, panorama, Video ([email protected], [email protected]/60fps, [email protected]/60/120fps, [email protected], HDR10+, stereo sound rec., gyro-EIS & OIS)   Dual 12 MP, f/1.8, 24mm (wide), Dual Pixel PDAF, OIS + 12 MP, f/2.2, (ultrawide), LED Flash   Geo-tagging, touch focus, HDR, panorama, Video (4K@30/60fps, 1080p@60/240fps, 720p@960fps, HDR10+)  
Front Camera 10 MP, f/2.2, 26mm (wide), 1/3.24   10 MP, f/2.4, 26mm (wide), HDR, Video (4K@30fps)  
OS Android 11 OS   Android 12 OS  
Chipset Exynos 2100 (5 nm)   Qualcomm SM8475 Snapdragon 8+ Gen 1 (4 nm)  
Processor Octa-core (1 x 2.9 GHz Cortex-X1 + 3 x 2.80 GHz Cortex-A78 + 4 x 2.2 GHz Cortex-A55)   Octa-core (1 x 3.19 GHz Cortex-X2 + 3 x 2.75 GHz Cortex-A710 + 4 x 1.80 GHz Cortex-A510)  
GPU Mali-G78 MP14   Adreno 730  
Sensors Accelerometer, Barometer, Compass, Fingerprint (under display, ultrasonic), Gyro, Proximity, SpO2   Accelerometer, Barometer, Compass, Fingerprint (side mounted), Gyro, Proximity  
Browser HTML5   HTML5  
Sound 32-bit/384kHz audio, MP4/DivX/XviD/WMV/H.265 player, MP3/WAV/WMA/eAAC+/FLAC player, Speaker Phone   32-bit/384kHz audio, Tuned by AKG, Speaker Phone  
Colors Phantom Gray, Phantom White, Phantom Violet, Phantom Pink   Bora Purple, Graphite, Pink Gold, Blue, Yellow, White, Navy, Khaki, Red  
Battery - Fast charging 25W, USB Power Delivery 3.0, Fast Qi/PMA wireless charging 15W, Reverse wireless charging 4.5W   (Li-Po Non removable), 3700 mAh   - Fast charging 25W, 50% in 30 min (advertised), Fast wireless charging 15W, Reverse wireless charging 4.5W  
Misc Glass front + Gorilla Glass Victus), Plastic back, Aluminum frame, Stylus support, Tuned by AKG, Active noise cancellation with dedicated mic, ANT+, Bixby natural language commands and dictation, Samsung DeX, Samsung Wireless DeX (desktop experience support), Samsung Pay (Visa, MasterCard certified), IP68 dust/water resistant (up to 1.5m for 30 mins), Document viewer, Photo/video editor   SMS(threaded view), MMS, Email, Push Mail, IM   Plastic front (opened), Glass back + Gorilla Glass Victus+), Aluminum frame, IPX8 water resistant (up to 1.5m for 30 mins), Armour aluminum frame with tougher drop and scratch resistance (advertised), Samsung Pay (Visa, MasterCard certified), Documet viewer, Photo video/editor