said by NefCanuck:
To my mind, if the carriers TOS for the open beta clearly stated up front that users cannot modify their phone's ROM, then the users are clearly in violation and could, quite legitimately be booted from the service.
I skimmed through the TOS on their website and did not see anything that specifically prohibits modifying the rom. The only thing that is close is
You will not (and will not permit Users to):...(v) modify any software included in any Mobile Device(s);
The question then becomes does rooting the phone or installing custom firmware "modify" the software or replace it?