If you use a SSL Certificate provider that is not embed in the iPhone you need to add the CA to your phone in order to access SSL servers.

- Download and install Apple's iPhone Configuration Utility.
        Windows -> http://support.apple.com/kb/DL926
        Mac -> http://support.apple.com/kb/DL851

- Download and install your CA Root Certificate
        - If you are using the free certification authority Cacert.org the file can be found at https://www.cacert.org/index.php?id=3
        - Files are usually ended in .crt, .der, .pem, .cer

- Create a new Configuration Profile
        - Open the iPhone Configuration Utility and create a new configuration file "File" -> "New Configuration Profile"
        - In the "General" tab the "Identifier" field is mandatory and should be provided by you
        - Go to the "Credentials" tab and click "Configurate", a new window will popup
        - Choose the certificate you want to install on your phone from the list and click "Ok"

- Export the new Configuration Profile (If you plan on sending the file to another user, otherwise skip these steps)
        - With your nearly created profile selected click the "Export" button, or go to "File" -> "Export"
        - Choose "Sign configuration profile" from the drop-down list shown on the new screen and click "Export..."
        - Name your configuration profile and click "Save"

- Install the Configuration Profile on your phone (Using Apple's Configuration Utility)
        - Connect your device to the computer
        - A new "Devices" menu will appear in the iPhone Configuration Utility
        - Select your device then click the "Configuration Profiles" tab
        - Your should be able to see all configuration profiles installed on your device and the ones available to be installed
        - Choose the one we just created and click "Install"
        - The Install Profile screen should now be displayed on your phone
        - Click "Install" and "Install Now" if you believe everything is correct

- Install the Configuration Profile on your phone (Not using Apple's Configuration Utility)
        - Email yourself the profile you created
        - Open the email attachment on your phone
        - The Install Profile screen should now be displayed on your phone
        - Click "Install" and "Install Now" if you believe everything is correct

- Removing a Configuration Profile
        - Settings -> General -> Profiles -> "Your profile name" -> Remove


* The attachment above can be installed into your phone if you wish to use CAcert.org as your CA.