ios6-calendarJust thought I want to share a little tips about syncing multiple Google Calendars (under the same Google account) with iOS devices (iPhone/iPad/iPod touch).
For several years, there are two ways to sync Google Calendar with iDevices : using exchange account or directly from the Google account then choose which calendars to sync from m.google.com/sync (opened from the iDevice)

I just noticed that in the last few days, only my primary calendar is synced with my iPhone.
I opened the usual m.google.com/sync and found out somehow my other calendars are unchecked there. Weird. But I checked those calendars again and hit save button, expecting that all my calendars will now synced to iPhone. Nope, still the same problem.

Searching for the solution of this problem from the Internet was not so easy since there are so many articles still referring to the old link (m.google.com/sync) and some old articles still suggested using the exchange account. After some searches, apparently Google changed their calendar selection page some time in September 2012 (not quite sure when). Now, we need to go to www.google.com/calendar/syncselect (can be opened from computers or iDevices) to choose which calendars to sync. I tried this link, checked my calendars there, and… now they’re back to my iPhone !

Hope you’ll find this useful =)