I'm using the iPhone app, and have two friends in the game. One is a few divisions ahead of me, the other is the same level but not in my exact league. Is it possible they are both in my server?

How do I attempt to watch their games or see upcoming fixtures on iPhone? I think this may be the only way to tell if they're in my server.

Also how is server determined? Is it simply joinup time or is it IP address?