How do I call forward on Telstra DOT?

Call forward always

1. Lift handset wait for tone.
2. Enter *72# followed by the number you wish to forward to. Eg. *72# 0400 000 000 then hang up.
3. Hang up.
4. To turn it off again. Lift handset, wait for tone. Enter *73# and hang up.

Source: Telstra Crowd Support