UPDATE: See this comment. Presto has changed the free months to 3 (instead of 6).
Telstra are giving T-Box customers 6 months of free Presto - but it's just a coupon code so can't see why it wouldn't work for everyone.
Make sure you access it through presto.com.au/telstra - fill in your details, confirm your email address, then choose the $14.99 a month plan and apply the coupon code in the box below it and it will give you 6 months 3 months of free Presto.
Presto has it's flaws, the catalogue is a bit average especially for TV - I think Netflix and Stan are better, but it's pretty great for free.
You've got until June 30 to take up the offer and you do need to provide credit card details - just make sure you cancel before the trial is up if you don't want to be charged.
Enjoy!
The Foxtel Go app is coded to block HDMI out (MHL & Slimport). It will work if you cast the screen via the Chromecast app or native casting if your device supports it.