If the user grants access to the userProfile data, this method will return the contents of the named attribute. The same attribute names that were used when the request was queued should be used here. These are all member attributes belonging to the vCard object.
You should call this method once for each attribute you need. If you have not been granted access to any attribute you will simply receive a null value.
Some documentary sources suggest that this method is largely dysfunctional on a variety of platforms.