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

I couldn't get contacts to sync after updating to IOS 9.2.1. However I finally did get it work by selecting "Windows Contacts" in the "Sync With" line under "Info" in itunes. It happily sync'd my one windows contact. Then I selected "Outlook" under Sync With and it synced all of the outlook contacts. I guess this step initialized something that wasn't quite right... ymmv.

I'm a new iPhone user and I'm having the same issue. I added outlook and gmail and they don't synchronize not even the email contacts. I was a blackberry user and finally changed to Apple, I work with my phones and I send several mails/day, something this phone is not letting me do because the contacts are not sync'd. I have and iPhone 6, iOS 9.2.1. I tried deleting the accounts and setting them again. It did not work.

Please I need a fast and simple solution, I'm just a beginner in Apple.

Thanks!

Full credit to majabuna for the solution - at least on my iPhone 6+, iOS 9.2.1.

All you have to do is make any edit in the "Notes" field to any Contact on your iPhone and . . . that's it. Done. The phone syncs in a second or two and captures all changes to all Contacts. (Both ways. Make a change in Google Contacts on your Mac or PC and it syncs to your iPhone. Make a Change to the Contact on your iPhone and it syncs in Google Contacts on your Mac or PC.)

FYI

Settings -> Mail, Contacts, Calendars -> Fetch New Data [set to "Push"; checked "Manually" at bottom of screen] -> Gmail [set to "Fetch"]

It didn' work for me. I don't know what else to do.

Had the same syncing problem after updating to ios 9.2. Reset network settings and gmail calendar synced hooray!

Sorry, what did you exactly reset?

go into settings, then go to Reset, then click on Reset Network settings. The device will then restart and the Gmail calendar should sync onto the icalendar then. Hope that helps!

Followed your steps and it totally worked! Thank you.🙂