Why did it take so long to realise? Well, I use the GMail app for all my mail, and that has worked fine. eg I don’t actually know if the Calendar was syncing back when I upgraded my 4S to iOS7. Why mention this timeline? Simply because given how long it took me to realise the issue, I’m not sure whether the issue is due to iOS7 itself, OR to a restore to iOS7. Summary: The iPhone 5 is running iOS7 with my backup restored to it.I realised on 16 October that my iPhone 5 is not syncing my Google calendar.I restored my iPhone 4S backup to the iPhone 5.I inherited an iPhone 5 on 04 October – it was running iOS7.I upgraded my iPhone 4S from iOS6 to iOS7 on 22 September.My scenario is a little cloudy though, but amounts to this: Googling this, it turns out to be a pretty common issue, but with a variety of scenarios. And after a little testing it turns out my Contacts weren’t syncing either. However for the past week or two my calendar hasn’t been syncing on my iPhone. For years these have all working seamlessly on my iPhone and iPad as well as my Android devices – a Nexus 7 and and HTC One. My email, calendar, contacts, etc are all part of Google Apps. Solution: You need to completely delete your Google account from your iPhone and re-add it, making sure you use an Application password (if you use Google 2-step verification). Also Contacts don’t sync with Google contacts. Problem: Google Calendars (eg from Google Apps) no longer show in iOS7 Calendar apps. So here’s hoping the following might save you a few minutes… I had a reasonably frustrating time with this issue this morning, and it took me about 2 hours to finally solve.

Iphone cannot see shared calendar