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QUESTION
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How do I view all of my calendars or sub calendars on my iPhone, iPad, or iPod?

 

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ANSWER
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It is impossible to find this setting naturally through all of Google’s complicated settings and menus.

All you have to do though is logon to your gmail account, and then click this link to get to the setting you need:
https://www.google.com/calendar/iphoneselect

If you are a Google Apps user, you must use this URL: (substitute your domain for <yourDomain>)
 https://www.google.com/calendar/hosted/<yourDomain>/iphoneselect

Once there, click the checkboxes for each sub calendar you want viewable from your iPhone, and click Save.

Then on your iPhone go to the calendar, click the Calendars button at the top left, and select each of the sub calendars under your Gmail account you want to view on your iPhone.

(Note: your Gmail account must be setup on the iOS device under the Gmail specific account type for this to work)

 

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EXAMPLES
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APPLIES TO / KEY WORDS
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GMail Calendar
Sub Calendars
Multiple Calendars
Google
google.com

 

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REF
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https://groups.google.com/a/googleproductforums.com/forum/#!topic/calendar/lQEyB2C4SRQ

https://www.google.com/calendar/iphoneselect

 https://www.google.com/calendar/hosted/<yourDomain>/iphoneselect

 

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http://www.anysitesupport.com/how-do-i-view-all-of-my-google-calendars-on-my-iphone/
http://anySiteHosting.com