I bet Xavier goes after the guy who beat him too, phoning home is not the worst thing to happen in TUF...what about that little backyard fight, that was worse.
I did find it funny how they were acting like Dana would send half of the cast home...come on now.
The problem with phoning home is that there is nothing stopping the people they spoke too, going online or whatever and posting the results (assuming thats what they talked about).
The reason Dana didn't send them home was probably because they spoke to whoever they phoned and warned them not to speak to anyone about it. Had any news about results or anything leaked online... they'd be gone.