is not usedduring the creationof a recipient(regardless of how itis created): that field will not be populated with the default value when the recipient is created
is notused informs that contain that field(example: a registration form): same as above.
is only usedwhen the field isinserted into amessage as a dynamic field. Whenthe field is emptyfor a recipient,the default valueis inserted into themessage(for moreinformation see:using dynamic fields)