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The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
I got a yellow triangle warning in my iPhone and calendars do not sync. I have tried all the usual but does not work. Any ideas?.
iPad seems ok but does not sync with iCloud Calendar in PC either
[Re-Titled by Moderator]
iPhone 15, iOS 18
After weeks of this problem of not synching since the iOS 18 update, and hours with senior support, I found the problem and solution.
there was a trojan virus on the Mac.
bit defender is free on the app store
run a deep system scan, and see if you have a virus, remove and then everything was perfect again.
Mac support never even thought about a virus, because they are told that it cannot happen when the new IS is installed.
so I educated them
After weeks of this problem of not synching since the iOS 18 update, and hours with senior support, I found the problem and solution.
there was a trojan virus on the Mac.
bit defender is free on the app store
run a deep system scan, and see if you have a virus, remove and then everything was perfect again.
Mac support never even thought about a virus, because they are told that it cannot happen when the new IS is installed.
so I educated them
Already tried that. All the standard fixes have been tested with no result. The calendar is native IOS
My iPhone Calendar is not syncing with iCloud
