Yup still living in the dark ages here, I use TTY too. Haven't really kept up with modern technology, I only got my computer (well, laptop) a few years ago, before that, I used to rely on TTY heavily for communication with the world and keeping in touch with family. Up til a few years ago (8 years ago) I didn't have a mobile phone, had never heard of SMS, didn't have a computer, had no clue about internet.
So it's a sort of generation thing, even though im still in my late 30's lol 
I rarely use TTY as I keep in touch with my friends now via text messages on mobile and emailing on internet. Yahoo/MSN messengers also good for keeping in touch.
I would love to give Videophone a try though, when it comes to Australia! although I have forgotten how to use sign language....
it would be cool to keep in touch with family and what they look like (I haven't seen my sister or brother in person for over 4 years now! they live too far away).