Once a user makes a melection, how can you display info from another form based on the selection?

Once a user makes a melection, how can you display info from another form based on the selection?

Hey --
 
I have two forms -- one with names, phone numbers, and address.  On the other form, I want to have it so that when a user selects a name from a drop down menu, the phone number is displayed for that person (from the first form).
 
I know that it probably has something to do with using "Actions on User Input", but I can seem to get it to work.
 
Also, is it possible for the phone number not to show up once the survey is submitted?
 
Thanks so much -- I'm still learning.