Q: iCloud not syncing from iPhone.

Go to Settings>Mail,Contacts,Calendars>Default Calendar and make sure you have selected the calendar listed under your iCloud account ID as your default.  If not, change it, then add an event and see if it syncs now.

Try going through the troubleshooting steps listed here under "Troubleshooting iOS Devices": http://support.apple.com/kb/TS3999.

Did you try turning iCloud calendar syncing to Off on your phone (if your iPhone calendar isn't backed up when you do this be sure to choose to keep the data on your phone if prompted), then restarting your phone and turning it back to On?

Some users are reporting wifi issues with iOS 6 that are effecting iCloud syncing (such as photo stream not working).  Are you experiencing other issues related to iCloud, e.g. an inability to upload photos to photo stream?

Are you syncing contacts with any other external service on your phone, such as a gmail exchange account?

Sorry, I meant to ask if you were syncing your calendar with another external service, not contacts.  I assume the answer is no to that too.

If you went through all the troubleshooting steps for iOS devices in the linked article above and that didin't resolve it I don't know what else to suggest.  If it were me, at this point I would make an appointment with the genius bar at a nearby Apple store and have them take a look at it.  They may need to contact iCloud support, but themselves but at least that wouldn't cost you anything.

You're welcome.  Good luck.

Hi

I've just posted the same problem as you. I have tried all the troubleshooting suggestions - several times. Did you get anywhere with the Apple Store?

thanks