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After upgrading to iOS 7, the + (plus) sign on my calendar is grayed out. I cannot add new appointments. I even tried using Siri to add an appointment and the response is "Sorry, I'm afraid I can't do that."

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marked as duplicate by bmike Dec 7 '13 at 13:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

I had to turn on calendars in iCloud (settings/icloud/turn on calendars). Give it a second and it should work after that :)

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