Phonewords are telephone numbers that also spell a word - for instance 1300 MR PHONE WORDS.
Each letter of a phoneword correlates to a number on your telephone keypad. For example A, B and C = 2, D, E and F = 3 and so on.
To dial a phoneword, you simply dial the number that relates to the letters of the word. I.e. 1300 GARDEN becomes 1300 427 336