Display imported Google calendars on iPhone

Make sure you open all the links on iPhone:

1. Enable all the calendars you need at https://www.google.com/calendar/iphoneselect  

2. From iPhone , goto Settings -> Mail -> Gmail Exchange ->  disabled then re-enabled Calendars.

3. Then goto https://m.google.com/sync/settings/iconfig/welcome?source=mobileproducts&hl=en , where you can select device and additional calendars.

4. Once you open up your Calendar application, you should be able to see all your imported calendars!