iPhone ActiveSync Configuration - Exchange 2013
On your iPhone
Add Account and tap Exchange
Mail, Contacts and Calendar
Enter your Email Address into the Email Address field, enter your Password and then select Next.
If a server cannot automatically be discovered you will be asked to enter a server name.
Enter the Exchange Server and go to 2.
Exchange server: outlook.hs20.net
The Domain can be left blank and your Username is usually the same as your Email Address. Select Next
If the Account configures successfully, you will be asked to choose which content you would like to synchronize: Mail, Contacts, and Calendars.
Select Save when finished.