How to set up Calendar on iPhone and iPad. Whether you use Apple's iCloud, Google's Gmail, Microsoft's Outlook or Exchange, or something else, it's easy to set up all your calendar accounts and have them sync to your iPhone or iPad.
Select what you want to sync (Mail, Calendar, Contacts, Reminders). Tap Save. You can go back to Settings and configure how many days of mail you want to sync, along with advanced settings like SSL and S/MIME as well.