Address Book

 

The Address Book's entry Details button brings up a Private check box and a Show In List pop-up menu.

The Private check box lets you mark the current entry as Private, so that it is invisible when you set Security ON (which see).

The Show In List pop up lets you choose which phone number (Home, Work, Mobile, E-mail, whatever) to display when you are looking at the Address Book in its List form, where it displays 8 or 11 names at a time.