They normally have that view, but it stopped working today and they moved everything around on the screen after it broke. It has generally been a well kept secret, but I guess it is out. It is meant mostly for internal viewing and family, so I would say mostly keep it to yourself and others you like and be respectful otherwise the Phillies will absolutely take it away.
The same channel has Threshers home games and now that you know how to search for it, there is a DSL home game channel as well (for both teams).