as an hearing impaired customer of new gm car purchased sept 22nd to this date i am very angry with the way onstar-tty treatment has not response on how to get tty-onstar system device upgraded on my 2009 CTS as they failed to fax the information to the dealership and dealership staff member went out of their way getting information required and were told it not available on the cts but only on more expensive model and suv despite saying it is available on 2007 and newer gm except saturn, pontiac model etc and say there is confusion on the... read full review »