It depends on your plan, if you are on older plans then no you don't get access for free.
If you upgrade to a newer plan, then yes you can.
I'm a Yes-Crowd Contributor, not an Optus Employee, and I contribute on a voluntary basis. Did someone on Yes Crowd answer your question? Did they share a great tip Please remember to acknowledge their awesomeness by throwing a Kudo and or Accepted Solution their way.