You can use your
GMX
Organizer with
the calendar app that comes with your iPhone/iPad.
-
Open the
Settings on the home screen of your
iPhone/iPad.
-
Select
Mail, Contacts, Calendars.
-
Select
Add account.
-
At the very bottom, select
Other.
-
Select
Add CalDAV account.
-
Enter
https://caldav.gmx.com/ as the server address.
-
Enter your GMX email address and password.
-
If applicable, enter a description of the calendar.
Your calendars are
synchronized. If you edit your
GMX
Organizer, the
changes will appear in the calendar on your iPhone/iPad and vice-versa.