Apple in the latest iOS 18.1, iPadOS 18.1, and macOS Sequoia 15.1 betas no longer requires users to set their device region to the United States, so now it's just the US English language requirement that remains.
In previous betas, users not only had to change Siri's language to the US to access Apple Intelligence, but they also had to change both their device region and language to the US as well.
However, as per the latest release notes and spotted by 9to5Mac, the requirement to change device region to US appears to have been dropped, which means things like measurement system, temperature, and calendar formatting can remain unchanged with Apple Intelligence enabled.
In other words, users running the third betas of iOS 18.1, iPadOS 18.1, and macOS Sequoia 15.1 only have to ensure that English is their preferred language in Settings ➝ General ➝ Language & Region, and that English (United States) is the set Siri language in Settings ➝ Apple Intelligence & Siri.
With those two settings in place, users outside of the US can opt to join the Apple Intelligence waitlist, which in most cases gets accepted in just a few minutes. Note that Apple Intelligence remains unavailable in China, while users in the EU must still have a device signed in with a US App Store ID.
Apple Intelligence encompasses a range of capabilities, including composing text and emails, automating actions across various apps, generating images, summarizing documents and texts, and more.
These features require a lot of on-device computing power, so before you do anything, it's worth checking if your device is compatible. iPhone users need either an iPhone 15 Pro or iPhone 15 Pro Max to run Apple Intelligence, while only iPads and Macs powered by M1 or later Apple silicon processors are compatible.
