Not as great as the recent deals from Optus, but one of the better Telstra deals for a while.
Double Data on the $50 BYO/Casual plan. Normally has 2.5GB data.
Now:
* 5GB Data
* $1000 Calls
* Unlimited SMS/MMS/Messagebank
* Excess data charged at $10/GB blocks.
If you have an iPhone, I imagine you can get the free 12 months Apple Music offer + additional 500MB (bringing it to a total of 5.5GB!). See here.
Home page at https://www.telstra.com.au/ says it is for NEW connections only, valid until 28th September 31 December 2015. I had a talk with one of their online chat CSRs and this DOES extend to people on prepaid. Existing numbers on Telstra plans aren't eligible apparently (although the page with the plan listed doesn't mention any T&Cs at all).
Didn't the bonus data offer (500mb) expire 30th Aug?