Set up mail, contacts, and calendar accounts
In addition to the apps that come with iPhone and that you use with iCloud, iPhone works with Microsoft Exchange and many of the most popular Internet-based mail, contacts, and calendar services. You can set up accounts for these services.
Go to Settings
> Passwords & Accounts > Add Account.
To add a mail account, tap an email service—for example, Google, Yahoo, or Aol.—then enter your email account information.
To add a contacts or calendar account, tap Other, then do any of the following:
Add a contacts account: Tap Add LDAP Account or Add CardDAV Account (if your company or organization supports it), then enter your information; see Use other contact accounts on iPhone.
Add a calendar account: Tap Add CalDAV Account, then enter your information; see Set up multiple calendars on iPhone.
Subscribe to iCal (.ics) calendars: Tap Add Subscribed Calendar, then enter the URL of the .ics file to subscribe to; or import an .ics file from Mail.
For information about setting up a Microsoft Exchange account in a corporate environment, see the Apple Support article Set up Exchange ActiveSync on your iPhone, iPad, or iPod touch.