I got the phone to come up on AT&T but it couldn't figure out the phone number. The Network however just worked.
I think as long as you don't try to make it always GSM, it won't kill the phone app; that is, don't do the part on the other forums where they set it to GSM only (like WCDMA/GSM (Preferred)). Or you'll have fun going through a factory reset.
You will need to do the RadioComm edit.