How to add calendar subscriptions to your iPhone or iPad
Launch the Settings app on your iPhone or iPad.
Tap on Passwords & Accounts.
Tap on Add Account... ...
Tap on Other.
Tap on Add Subscribed Calendar under the Other section.
Enter or copy in the server location of the calendar.
Our calendar ID firstname.lastname@example.org
Subscribe to a Calendar on Your Android Device or to Google Calendars
It works best to subscribe to a calendar using a computer.
Find the calendar on our website that you want to subscribe to.
Find the Link at the bottom right side of the calendar, and click the Link.
If you are not logged into your Google Account, you will be asked to log in.
The calendar will be added to your calendar list.
On your Android device that is synced to your Google Account, verify that Sync Calendars is selected in Settings.