Just noticed that Telstra Air free Wifi has been extended till 27 March 2018 (unless offer is extended). Can be used by activating $2 sim from here https://www.telstra.com.au/mobile-phones/prepaid-mobiles/fre….

From the Website:

Our free Telstra Air data offer has been extended until 27 March 2018. So if you’re an eligible Telstra mobile or home broadband customer, you can continue to enjoy free data at over 750,000 Telstra Air hotspots across Australia, and over 19 million Fon Spots overseas (from 28 March 2017 until 27 March 2018 Telstra Air home broadband members will no longer be required to have data left on their home allowance in order to take advantage of the offer). That way, you can save your mobile data for when you’re on the move.