Select the desired phone type. Right under the name of the phone type you can see the shortcut for it.
To add a new phone type, select "New" from the action picker.
Enter the description of the new phone type and define the shotcut. Now tap on "Save".
To remove a phone type, select it and remove it with the action button.
You can define an phone type as the default. This phone type will be the suggested one for new phone numbers.