• 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.
• Enter or copy in the server location of the calendar. This is typically a web address that ends in .ics.
• Enter any username, password, or SSL info you need to. Most times you don’t have to with public subscriptions. When you are finished, tap on the Done button in the upper right hand corner.
• That’s it, the subscribed Calendar will now show up in the Calendar app.