Question about photon multiplayer.

I was looking at photon as a solution for my multiplayer game, everything looked great until i found this on a website:

(Photon server application is not aware of Unity geometry, physics and the collision system, which means we would need to recreate all those parts on the server side.)

What exactly does this mean, i have a lot of "OnTriggerEnter" in my game, does it mean they won't work?

And does photon work on blackberry, windows phone and web player also?

Thank you