Apple Intelligence is currently not available for iOS and iPadOS devices in the European Union (EU). However, it is available on Macs running macOS Sequoia 15.1 or later.
For iPhone and iPad users in the EU, Apple has announced that core Apple Intelligence features will start rolling out in April 2025. (Source)
Some users have tried workarounds like changing their Apple ID region or using a VPN, but these methods are not reliable or recommended. The best option is to wait for the official rollout in 2025 to get a stable and full experience.
For more updates, you can check Apple’s official support page: support.apple.com.