After much hair pulling it appears that this phone will work with the GX470! As I had thought there was a software issue with the blackberry 7100t preventing discovery. The odd part is that even after upgrading to the latest tmobile software release - (4.0.2.32) which is a later release than the latest cingular release the phone still did not work. In an act of desperation I pulled the battery out to do a complete handset reset and tada we are synced with the Lexus! There is still the common blackberry phonebook syncing issue but the bluetooth connection for phonecalls works great.
