My phone will not update and has an error on cellular data cellular data failed
How do I repair the cellular data failure and update my phone
iPhone 7 Plus
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This is a user-to-user forum. You will get a response when a user-volunteer sees your post and has a possible solution for you. there probably weren't any users around at the time you posted and it was superseded by other posts.
Anyway, see this Apple support article-->If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart - Apple Support