We just got my wife's new-to-her Drois Eris setup yesterday. It came from MD and we are in ND. I am fairly certain I read somewhere on the HoFo about what the local tower codes are and how to update a phone to them. I'm guessing #228 doesn't work with PPC like it does for VZW.
I can't find that thread now. I've been looking in the PPC forum, HTC forum and Android forum. I don't believe I've read any other forum so I'm pretty sure I saw a thread in one of those 3 forums.