Go to Settings on your iPhone and click on Mail.

Click on Accounts.

Select Add Account.

Press Other.

Now click on Add CardDav-Account.

Now enter the server.

As Email enter the address you have received from us. For example max.muster@example.com.

As password enter the password we gave you.

As description, enter a description which is later used to identify this account and press Next.

You have now successfully synched all your contacts to your phone.