Compatible models
Yes: iPhone 15 Pro, 15 Pro Max, iPhone 16 (all), iPhone 17 (all). No: Standard iPhone 15, 14 and earlier.
Does it work the same on refurbished phones?
Yes, completely. Apple Intelligence does not distinguish between new and refurbished. What matters is the chip.
The best option
The refurbished iPhone 15 Pro: A17 Pro chip, ProMotion, Apple Intelligence, USB-C. The most reasonable entry point.
Is it available in Spain?
Yes. Apple enabled Apple Intelligence in Spanish for Spain in 2025.