Tell ur mom that, get a Smartphone, or use PC with AIM, MSN, Yahoo or whatever you have,
Emailing via smartphone or PC if she have
Or go online and log in her cellular co's website into her account and there are "text" message she can send and recive via PC.
There's plenty of options your mom can use.
She got to understand that TTY are really obsolete!! It's time to move on to new technology.
Catty
