Shop Talk

We have been told different things as far as Premium Plans are concerned. We have been told that if a cutomer wants to be on a Premium Family Plan that every phone on the account must be on the Premium Plan as well. Now, we have also been told and in the pricing book as well as eroes shows that a customer may have a secondary line on a Select Plan while the main line and other secondary lines are on Premium Plans. What is the answer to this? Can customers have a mixture of Select and Premium Lines on a Family Share or must they all be on Premium Lines if the Primary Line is?