Considering your ADSL plan, is the data limit (whatever it is) suitable, considering maybe working from home or home schooling? What ADSL speed do you get? What speed do you get with a speed test? Is that acceptable currently? NBN comes with a free VOIP phone service where you pay for calls as you go. Or you can buy a phone plan with different combinations of included calls.
You can see the plans on TPGs web site.
There's also comparison web sites.