You need to provide more information before anyone can answer that. What happens when you try? If you see an error message, what is the exact text of the error? What version of the iPhone do you have? Are you trying to update over the air, or with a computer and iTunes? Do you have the latest version of iTunes?
Why can’t I update my iPhone to iOS 12?
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I have a iPhone 7 Plus and I wanna know if I can get the iOS 12 update. The update hasn’t shown up on settings.
Question marked as
Apple recommended
An iPhone 7 Plus can update to iOS 12.
What happens when you go to Settings->General->Software Update?
if you are using a beta iOS you need to delete the iOS 11 beta profile.
I did delete it and it still doesn’t show up
Explain what steps you’ve taken and any messages you’ve gotten.
Why can’t I update my iPhone to iOS 12?