Originally Posted by cwichura
Based on those screenshots, it is still trying to use Orange's UNC (which obviously won't know the T-Mobile certs). The UMA spec says that the UNC information should come from the SIM card, though I don't know if RIM is following that or doing something on their own. It may be that you need a different service book sent down for it to get the proper UNC address.
I doubt RIM would be hardcoding anything. I would have thought this is either coded in the SIM card or in the certs but unfortunately still pointing to the Orange server, very puzzling .