Telstra customers get various "Thanks" benefits.
Most recently I purchased Guns'N'Roses tickets in the pre-sale period which was nice as I got good tickets which were sold out before the regular sale process even commenced.
https://www.telstra.com.au/thanks/music
Also NRL tickets (including finals) are reduced by 20%.
https://www.telstra.com.au/thanks/sport/nrl/finals
There are plenty of other benefits which you can check out here:
https://www.telstra.com.au/thanks
One benefit I haven't used before but I will tomorrow is a free BigPond movie every Thursday night.
Telstra Thanks Thursdays
Telstra customers can enjoy one movie rental every Thursday, on us.
Choose from three each week and redeem with a unique code.
AFAIK a Telstra customer is defined as someone who has a Telstra home phone, Bigpond Internet and/or Telstra mobile phone.
You can get a code from 12pm midday every Friday and they can be redeemed at BigPond Movies between 5.30am and 11.59pm on the following Thursday.
Seems like the Telstra thanks website is stuck in a loop. I've logged in but when I click "log in to get code" button it takes me back to the same page. When I navigate away I am still logged in.