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Samsung Galaxy S21 Ultra 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 / 1700(AWS) / 1900 / 2100   HSDPA 850 / 900 / 1700(AWS) / 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), 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 5G SA/NSA   SA/NSA/Sub6  
Dimensions 165.1 x 75.6 x 8.9 mm   162.8 x 77.6 x 8.2 mm  
Sim Type Dual Sim, Dual Standby, eSIM (Nano-SIM)   Nano-SIM + Nano-SIM + eSIM + eSIM (max 2 at a time)  
Weight 227 g   219 g  
Display Type Always-on display, 120Hz, HDR10+, 1500 nits (peak)   Dynamic LTPO AMOLED 2X Capacitive Touchscreen   120Hz, HDR10+, 2600 nits (peak), Always-on display  
Display Size 1440 x 3200 Pixels (~516 PPI)   6.9 Inches   1440 x 3120 Pixels (~498 PPI)  
Protection Corning Gorilla Glass Victus   Corning Gorilla Armor 2  
Memory 256GB Built-in, 12GB RAM   512GB Built-in, 12GB RAM, UFS 4.0  
Card slot No   No  
GPRS 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/6e/7, tri-band, Wi-Fi Direct  
BlueTooth v5.2 with A2DP, LE   v5.4 with A2DP, LE  
USB USB Type-C 3.2, USB On-The-Go   USB Type-C 3.2, DisplayPort 1.2, OTG  
NFC Yes   Yes  
GPS Yes + A-GPS support & Glonass, BDS, GALILEO   Yes + A-GPS support & GLONASS, BDS, GALILEO, QZSS  
Main Camera Geo-tagging, touch focus, face/smile detection, Auto HDR, panorama, Video ([email protected], [email protected]/60fps, [email protected]/60/240fps, [email protected], HDR10+, stereo sound rec., Gyro-EIS)   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 40 MP, f/2.2, 26mm (wide), 1/2.8   12 MP, f/2.2, 26mm (wide), 1/3.2", dual pixel PDAF, HDR, HDR10+, Video (4K@30/60fps, 1080p@30fps)  
OS Android 11 OS   Android 15 OS, up to 7 major Android upgrades  
Chipset Exynos 2100 (5 nm)   Qualcomm SM8750-AB Snapdragon 8 Elite (3 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 (2 x 4.47 GHz Oryon V2 Phoenix L + 6 x 3.53 GHz Oryon V2 Phoenix M)  
GPU Mali-G78 MP14   Adreno 830  
Sensors Accelerometer, Barometer, Compass, Fingerprint (under display, ultrasonic), 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 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 Black, Phantom Silver   Titanium Silver Blue, Titanium Black, Titanium White Silver, Titanium Gray, Titanium Jade Green, Titanium Jet Black, Titanium Pink Gold  
Battery - Fast charging 25W, USB Power Delivery 3.0, Fast Qi/PMA wireless charging 15W, Reverse wireless charging 4.5W   Li-ion 5000 mAh   - Fast charging 45W wired, PD3.0, 65% in 30 min, 25W wireless (Qi2), 4.5W reverse wireless  
Misc Glass front + Gorilla Glass Victus), Glass back (Gorilla Glass), Aluminum frame, Active noise cancellation with dedicated mic, Samsung Pay (Visa, MasterCard certified), IP68 dust/water resistant (up to 1.5m for 30 mins), Stylus support, Samsung DeX, Samsung Wireless DeX (desktop experience support), ANT+, Bixby natural language commands and dictation, 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