Is this an International version? Factory unlocked? Can I use it in Portugal and Europe? it has dual fiscal slots?It it SM-S938B/DS

Yes, it is the New International Version and is factory unlocked for worldwide use. It has Dual Nano SIM (Dual Standby) slots.

Does it have two nano SIM slot? Is it factory unlocked?Will it work in Portugal and Europe?

Yes, it has dual Nano SIM and is factory unlocked for worldwide use.

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SAMSUNG Galaxy S25 Ultra Cell Phone, 512GB, 12GB AI Smartphone, Unlocked Android, Dual Sim, New (International Version) - Titanium Gray

Model: Samsung Galaxy S25 Ultra New International Version
Storage & RAM: 512GB Internal Storage | 12GB RAM for smooth multitasking
AI-Powered Performance: Powered by next-gen AI chipset for smarter performance, efficiency & camera enhancements
Display: 6.9" QHD+ Dynamic AMOLED 2X | 120Hz Refresh Rate | Ultra-Bright, Edge-to-Edge Display
Camera: Quad Rear Camera Setup 200MP Main + Ultra-Wide + Dual Telephoto Lenses | 40MP Front Camera | Advanced AI Imaging
Battery: 5000mAh Long-Lasting Battery | Super Fast Charging | Wireless & Reverse Charging Support
Operating System: Android 15 with Samsung One UI 7 Seamless, customizable user experience
Unlocked & Dual SIM: Factory unlocked for worldwide use | Dual Nano SIM (Dual Standby)
Build & Design: Sleek Titanium Gray Finish | Premium Glass & Metal Build | IP68 Water & Dust Resistant
Connectivity: 5G Ready | Wi-Fi 6E | Bluetooth 5.3 | NFC | USB Type-C