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Mine was preparing for hours. Apparently I had to leave the AI page open while it downloaded stuff? Then it finally changed to a button I needed to click to enable it.
When I did mine earlier today took an hour and a half. Did my spouse later in the day and took 20 minutes.
 
And this is THE core feature of not only iOS18.1 but the new iPhone 16? And you have to join a waitlist and then toggle the thing on? After you download iOS 18.1?

Man that’s so unlike Apple.

It's still "Beta" (even after the 18.1 Update).
 
My iPhone and both iPads were up and running in about an hour. Siri seems much improved but time will tell.
 
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