On iOS 9 now. Calendars and contacts won't sync (exchange, iCloud, gmail or subscribed iCal).

I had the same problem. I tried deleting the Google acount and resetting it, also made sure it's not because the 2 steps verification but nothing worked. Eventually I resetted my network (in setting) and then the phone restarted and everything works perfectly since then...

I've tried resetting g my network multiple times with no luck. 😟

Does anyone else with this problem have an account under your Mail, Contacts, Calendars setting page for an OmniFocus Reminder Subscribed Calendar?? I was just noticing that I still have it listed on my iphone (where my google calendar will not sync) and I do NOT have it on my ipad where my google calendar is syncing fine (both on 9.0.2). I was also able to add my google account to my wife's iphone (9.0.2) and could sync my calendar fine there as well. So, it is something with my phone specifically. And the only thing different on my phone that hers and my ipad is this old no longer used subscribed calendar for omnifocus reminders. This was the way omnifocus would remind you of your to do items before push notifications. It has been there than long without me ever realizing it and removing it. So when I just tried to select it and get to the page to delete that account, the settings app suddenly closes without letting me delete. It will do that EVERY time I select the account to remove it. So there has to be something wrong with it and I wonder if it is what is causing sync issues with other accounts. Just a shot in the dark but maybe it has something to do with it.

Same problem, have tried the fixes listed in this thread and others. Fixes for some amount of time but eventually the problem resurfaces. No question this is related to iOS 9 and we're basically sunk.

Maybe your on to something. I have the same problem. I have an iPhone 5S on iOS 9, my calendar and contacts won't sync to or from the iPhone but do sync from desktop, web, and iPad. And I have that OmniFocus Reminder Subscribed Calendar. I can't delete it either, as it crashes to home screen just as you describe. Now, I also had that OmniFocus subscribed calendar on my iPad (which is still on iOS 8) and does not have syncing issues. At the very least, there's obviously something wrong with it since it crashes. It may or may not be related to this sync problem but it is worth noting.

This sync problem is very frustrating, because of all the devices, the iPhone is the most important place that it needs to sync to.

After a little (well a ton really) more testing, I really think it has something to do with a setting that is being carried over from a previous iOS version when you upgrade to 9. I upgraded to a 6s yesterday and restored the latest backup from my 6 to the new phone. At that point, I had not deleted the old data and settings from my 6, and both phones had the problem. I could delete my gmail and icloud account a hundred times and re-add them, but the calendars just would not sync. My gmail email would, but no calendar or contacts. So, I deleted everything off of my 6 and started from scratch. At that point, sync worked perfectly for calendars and contacts. Keep in mind that both are on iOS 9.0.2, so it is not inherently something wrong with the OS itself, but something that is carrying forward from settings or apps in a previous iOS version when you upgrade to iOS9 with data and settings already on your phone. If you start all over with just the iOS9 on the phone, everything is okay.

So I did what was the last thing I wanted to have to do.... I started all over on my 6s. Took it back to factory and added my data and apps back to it manually rather than through a restore process, which would have just added whatever corrupt setting thats causing all this to begin with. Now, about 8 hours later, all 188 apps and all my data is back and working fine. The only thing I lost (thanks to all the cloud syncing options in most apps) is my old text messages. But I was able to use a 3rd party program to back them up. My 30GB of photos luckily were in Google Photos as well, so I can move back across into my photo stream any I want local on the phone rather than in the cloud.

Hopefully Apple will figure this out, but I bet not. There just doesn't seem to be enough people with whatever setting or app on their phone that is carrying forward into iOS9 and causing this to happen. Maybe I am wrong, but good luck.

Man that's frustrating!

You lose both iMessages and text and any health data you might have been tracking for a year. What was the third party app you used to back up your iMessages? I really don't want to lose them. And could you get them back on to your phone after you started it as new?

I have one other thought I want to run by you. I successfully deleted the OmniFocus Reminder Subscribed Calendar from my iPad running iOS 8.4.1. Let's say, having done that, I upgrade the iPad to iOS 9 and find that having deleted that subscribed calendar solves the syncing problem. My iPad still has those iMessages/texts (as well as my iMac, now that I think of it). Will those messages "catch up" to an iPhone that has been restored as new? How does iCloud square the fact that my phone would be empty of messages while my iPad still has them? The data still exists, I just want to get it onto that phone! Do you know what I mean?

Thanks for your help!

Worked for me. Thanks!

So the: TURN OFF ICLOUD OR EXCHANGE OR GOOGLE CONTACTS -> RESET NETWORK SETTINGS -> And turning them back on AFTER RESTART

Is loading all my Google contacts back. Yippeeee :-)

I have the exact same issue with the subscribed OmniFocus calendar on the iPhone. I'm not able to remove it since the "Delete calendar" dialog window never opens but rather quits to the Home screen.

My Calendar will not sync, but I'm not clear what you guys are talking about when you say exchange or google apps. I use Outlook Calendar on my computer and used to be able to enter appts either on my phone or on my pc and they would always sync to the other device. It will not do that anymore. Is that the same problem you guys are having? I've tried signing out of icloud and reseting the network settings, but that did not fix anything.

Still won't sync for me.

The issue appears to be with Exchange not working with iOS 9. If you use Outlook, you may be connecting using an "Exchange" account and not an SMPT/POP account. Exchange used to work fine with Google Business Apps, Outlook, and any other calendar system that used Exchange settings. But, in iOS 9 and the two patches (9.0.1 & 9.0.2) Apple still hasn't fixed their Exchange synchronization with Calendar. This all worked fine in iOS 8. How Apple screwed this up is amazing to me since many corporate emails systems are based on Exchange. To learn more about what Exchange is, simply google "Microsoft Exchange Server." The problem isn't with Exchange, it's with Apple being able to get iOS 9 to work with Exchange accounts.

Seriously Apple, you need to get on this patch. You have a HUGE group of business users that you're making angry. Which Steve Jobs was back at the helm there since I'm sure he would have had his iOS team resolving this for your business email users....

Same problem.

It's a shame that such a basic feature still has not been fixed by Apple since iOS 9.

I was having the same issue with upgrading to IOS9 with my iPhone6 and this fixed everything for me. Note I was using the CardDav, CalDav open platform to sync Google with my iPhone 6.

Go to: Settings -> Mail, Contacts, Calendars.

Delete your Gmail accounts for Mail, Contacts, Calendars.

When prompted choose to delete from your phone as well.

Now Choose: Add Account

Now Choose: Google from this screen:

Enter your Gmail address and your pwd and it should sync. Hope this helps!

I had Calendar syncing problems with a Calendar event created in Calendar App on my El Capitan iMac. Neither m iOS 9.0.1 iPad Air, nor my iOS 7.1.2 iPhone4 would sync the calendar event I created on the El Capitan iMac.

SOLUTION for me:

1. Delete the iCloud accnt on the iPhone 4, and

2. Sign out of the iCloud accnt on my iOS 9.0.1 iPad Air.

3. Reboot both iPhone4 and iPad Air.

4. Add back the iCloud accnt on the iPhone4 and sign in. Reauthorize from another device.

5. Sign into my iCloud accnt on the iOS 9.0.1 iPad Air. Reauthorize from another device.

iCloud syncing works fine now for me.