T9 ("Text on 9 keys") allows words to be entered by a single keypress for each letter, as opposed to the multi-tap approach used in conventional mobile phone text entry, in which several letters are associated with each key, and selecting one letter often requires multiple keypresses. It combines the groups of letters on each device key with a dictionary of words.
To enter letters, select the text entry field, and use the buttons on the keypad to select the desired letter.
To enter numbers, select Text mode.
Scroll to and select '123'.
To enter symbols, select Symbols.
To enter Auto complete suggestions, scroll to Text options.