To
set the correct mode, dial the letters or numbers reset key before
typing your message. If your TTY does not have letters/numbers reset
keys, you can still get your TTY to generate the appropriate reset
codes by doing the following:
Procedure
If your message starts with letters, type a slash (/) or a
number and press the space bar a few times before you type your message.
This technique causes the receiving TTY to reset to letters mode.
If your message starts with numbers, type X or another letter
and press the space bar a few times before you type your message.
This technique causes the receiving TTY to reset to numbers mode.