iPhone calendars "Unable to update"
My iPhone calendars will not sync/update. When I open the calendar app at the bottom in red it shows today, & inbox. To the immediate left of the word "Calendars" at the bottom is an exclamation mark in a circle, when I tap calendars at the bottom to view my list of calendars "Unable to update calendars" is shown.
i have never had issues with calendars, I have turned iCloud on/off and the phone on/off but no luck.
iPhone 6s, iOS 10.1