I just verified that with “Self” level access and “View and print troop roster” privilege enabled they are able to see the contact info, phone and e-mail, for everyone in the Troop, adults and Scouts. That is accessed from Communicate → Member Directories → Print Roster or Contact List.
If you give them Unit level access then they will be able to see all information for everyone in the Troop, including home address, and contact info, all advancements, participation everything that is held in TT is available for everyone with Unit level access to see.
I just posted today asking for feedback on creating default roles, please see this post: