So, now that it's virtually been done, I have a question: Will the iPhone work on T-Mobile's 850 Mhz network? I'm roaming by default with AT&T (don't want them anyway...), and with T-Mobile I'm in their extended coverage area. I just want to know if even attempting to get service on my iPhone anywhere near me is possible. Thanks. Oh, and why can't the iPhone be used with Centennial? Not a SIM user?