How do you use t9?

well t9 is a quick way for typing you basically type the first button of a Word. u haft to get the hang of it like for hey you do 4-3-9 and whats up you do 9-4-2-8-7- ..space..8-9. its pretty simple just do what ever the first letter of the Word is type that 3 only once then the second 1 and so on.