1. Access your iOS Settings.

2. Locate the Mail option.

3. Access the Accounts section.

4. Add a new account.

5. Select account type Other.

6. We want to add a new CalDav account.

7. You should now see a screen asking for more information:

Server: This may vary depending on which server you’re hosted on – look for the Calendars & Contacts feature inside cPanel for the exact hostname to use.
Example: https://server.kc.epik.com:2080
Username: Your email address;
Password: The email account password;
Description: Any description that you want.

8. Leave the Calendars and Reminders options ticked, and click Save.

Once done, the cPanel calendar will be synchronized with the calendar on your iPhone.