Calendar subscription instructions for Apple device users:
Launch the Settings app on your iPhone or iPad.
Tap on Mail, Contacts, Calendars.
Tap on Add Account... under the Mail section.
Tap on Other.
Tap on Add Subscribed Calendar under the Other section.
No username or password information is necessary. You can use SSL if desired.
Tap the Next button.
Tap the Save button.
The subscribed Calendar should now show up in the Calendar app.