$500 off the purchase price of an iPhone 13: In-store deal (Claremont, WA): get a $500 giftcard towards an iPhone 13 by signing up to the $69 per month, 80 GB per month Telstra 12-month post paid plan. I think it's just $400 for other phones. I ported out of Telstra (to a $9 Vodafone prepaid from Woolies) 3 weeks prior.
$10 off a month port-in offer: After purchasing through JB's, I then contacted Telstra over their Live Chat and asked for a $10 credit to be applied - which was done by the first agent I spoke to. I just said I was promised it.
Bonus data: Please note that the $69 plan comes with a bonus 20gbs (so total comes to 80gb) but the first time the JB rep did it, he forget to apply it and I had to remind. No issues, as it's promised on the website.