I really like TTY a lot and it's great for keeping in touch with those who have a TTY. If I use Blackberry, while I do have Lormar Logic, I'll be left out of receiving incomming TTY calls, so TTY is very important to me.
While this is not my intention/place to advertise here but I'm hoping to sell my Ameriphone Q90D TTY since it didn't work with my Alltel Motorola V710--not very compatible unless I switch to analog, which my phone doesn't want to stay in analog... 
Have problems in Digital...
So I have signed up with VoIP Provider (not completly portable since can't use the TTY in the go unless it has Internet, with QoS consistancy in mind...) which is Vonage and have no problems with it except no 711 dialing...
I'm getting MyTTY straight to the apartment, hopefully by today or Tomorrow.
Hey I saw TeleBraille over at the Helen Keller National Center in Long Island, New York! 
It is very great for those who are blind and deaf, but it's over a thousands of dollars... (Well, braille displays at Freedom Scientific costs over $3,000 so that adds up to the cost of TTY.)
